Agate Village - You can return to Agate Village. The only difference is that there are different people and it is five years later. Additionally, when you enter Agate Village, go to the left without going up the hill. If you keep going there will be a cave. In the cave is a woman that will teach your Pokemon moves for free.
Alternate Pokemon healing - If you are somewhere where there are no Pokemon healing machines, find a PC. Put the Pokemon from your party onto the PC, then take them out again. They will all have full power.
Classic battle - At the Outpost stand, talk to the man with the pink hair. As you leave the stand he will challenge you to a battle. Accept and you will battle Rider Willie, the first trainer from Pokemon Coliseum. Also, the background music will be that from the Pokemon Coliseum battle. You can challenge him whenever you desire.
Dragonite - To catch Dragonite you must snag all the Shadow Pokemon (mostly caught by Miror B, if you did not catch them from the trainers). Then, the Miror Radar will go off and it will say Miror B will be in Geteon Port. He will be on the lighthouse at the very top. Battle him and he will use a level 50 Dragonite. Note: Be careful and save the game before you battle him.
Easy experience - Get the XP Sharing item, then equip it with an active Pokemon (the one you fight with). Go to Mt. Battle. When you fight there and win, your Pokemon that is out and battling will receive triple the amount of experience points. For example, if you get 300 experience points for both your Pokemon in play, it will now double to 600 experience points to whoever in your party holds the XP Sharing item. If a battling Pokemon holds the XP Sharing item, you will get 900 experience points for that Pokemon while your other Pokemon will still receive 300 experience points. This helps level up your Pokemon much faster.
Easy purification - To get your Pokemon purified easily, keep the Pokemon with you for at least ten minutes, then put them in the purification chamber. They will purify about 25% faster than normal. Additionally, when your Pokemon goes into reverse mode, do not use Cologne Scents. Instead, call your Pokemon in battle and it will open its heart with a full bar to make the purifying quicker.
Elekid - You must do something for the news crew to get Elekid. They will ask you to check with someone in the outskirts. His name Hordel and he is from Cipher. He will give you a Togepi at level 25 and ask you to purify it for him. Once this is done, you can keep it or take it back to him. He will trade you an Elekid at level 20.
Fight Bonsly - Find Bonsly on the ship in the desert. He will run from you. You need to put some food at the oasis Poke Spot. After awhile he will come to it. Then, go back to the old man. He will give a Battle Bingo card with Bonsly on it. Take it to the Battle Bingo place. Go into your pad and it will have the flash this card option. Pay 500 Poke Dollars to battle with Bonsly.
Fourth generation Pokemon - There are two new Pokemon in this game from the fourth generation. They are Munchlax and Bonsly.
Gateon Port items - When questioned by Acri at Gateon Port, she will give you one of four different items depending on your answers. To get an Amulet Coin, answer "Yes" to all her questions. To get a White Herb, answer "Yes" to two of her questions. To get a Mental Herb, answer "Yes" to one of her questions. To get a Quick Claw, answer "No" to all her questions.
Getting the most out of the Purification Chamber - To have the Purification Chamber working at its best, place any four Pokemon around the circle. Then, select a different Pokemon from either your party or PC. Move it over the Pokemon around the circle. When you move the new Pokemon over one of the ones you already set, see if the Tempo Bar goes up or down. Once it goes up, replace the old Pokemon with the new one. Keep doing this until you find the correct combination of Pokemon to make the Tempo Bar full.
Johto starters - It is possible to get all three Johto starters. Successfully complete Mt. Battle in Story mode to get one Johto Pokemon with their elemental hyper beam. Totodile will have Hydro Cannon. Cyndaquil will have Blast Burn. Chikorita will have Frenzy Plant. You can get all three starters by completing Mt. Battle a total of three times.
Larvatar - Catch a Wooper and give it to the man in Pyrite Town. He will trade you a level 20 Larvatar.
Lugia - Lugia can be caught at Nickledark Island. He comes out at level 50 after you defeat Cipher Boss Deathgold. To purify Lugia, get full tempo in all nine chambers. Then, place Lugia in one of the sets and it will be purified.
Master Ball - To get the Master Ball, see Professor Krane at the Pokemon HQ lab. He is in a room on the first floor. Talk to him and he will open up a passage in the floor. There is a chest in the room. Open it to find a Master Ball. You must have been to Citadark Isle at least once to get the Master Ball. It is best used on Lugia.
Miror B - You can find Miror B early in the game. The first time you encounter him, he will ask you to join his group. If you say yes, he will think that you are lying. Say no, and he will get mad. Either way, you will have to battle him. He has a Shadow Nosepass. The second time you encounter him, he will be on an island. When you talk to him, he will battle you again. This time he has a Shadow Dragonite, and also the Shadow Nosepass if you did not catch it earlier.
Mt. Battle Master Pokemon - The Mt. Battle Master Battlus has the following good Pokemon:
Powerful Pokemon combo - Go to Gatton Port and enter the parts shop. Talk to a man in there and he will tell you that he loves Evee (your original Pokemon). Eventually you will get to choose what you want your Evee to evolve into. Select Vaporeon and he will give you a Water Stone. Use it on Evee. Then, use the hint to get Larvatar. Give it Exp. Share and it will gain experience quickly. It will eventually learn Rock Slide. Then, go to Relgam Tower and buy Blizzard. Teach it to Vaporeon. These two Pokemon and their moves are very powerful; it is hard for you to lose with them.
Premier Ball - Go to a shop and buy about ten Pokeballs. The shopkeeper will say "Thank you! As a bonus have a Premier Ball!".
Second chance at catching Pokemon - If you accidentally kill a Shadow Pokemon, do not worry. After you acquire the Miror B Radar, every once in a while it will tell you that he is at the Rock Pokemon catching spot. Go there and fight him and he will have one of the Shadow Pokemon you accidentally killed before.
Shadow attacks - The Shadow Pokemon have some Shadow attacks. There are 18 Shadow attacks in all. They are Shadow Crush, Shadow Attack, Shadow Wave, Shadow Rave (same as Shadow Wave except stronger), Shadow Weather, Shadow Down, Shadow Half, Shadow Mist, Shadow Remove, Shadow Hold, Shadow Panic, Shadow Storm, Shadow Break, Shadow End, Shadow Chill, Shadow Bolt, Shadow Fire, and Shadow Blast.
Snag six Shadow Pokemon at once - The final Boss has six Pokemon to be snagged: Rhydon (level 46), Zapdos (level 50), Tauros (level 46), Exeggutor (level 46), Articuno (level 50), and Moltres (level 50). Go to the Outskirts and buy twenty of every kind of Pokeball. You should also use your Shadow Pokemon against his and they will not do very much to each other. Additionally, in the final battle with Greevil, if one or more of the Shadow Pokemon faint, do not reset. Just win and fight him again. He will have the one(s) that you missed, and the rest will be normal. Also, if you already have Shadow Lugia, you will only battle Greevil.
Snag two Shadow Pokemon at once - Occasionally some trainers will have two Shadow Pokemon to snag; be careful when this happens.