Read the official IronMON Rules first, as well as the version specific rules for FireRed and Emerald!!

• BST limit for Kaizo, Survival and Super Kaizo is 599 including legendaries. For Pokémon with banned abilities, this limit is 420 inclusive. 600+ BST mons may be obtained only through evolution, except for 601+ BST legendaries. For example, a Cosmoem could evolve into a Mega Gallade, but not a Mewtwo. (The randomizer will prevent this from happening anyway)
  • If playing Standard or Ultimate, the BST limit is 640 inclusive, and the Legendary evolution exception does not apply. Go ahead and acquire a legal Arceus by evolving a Vigoroth
• You may have up to 9 favourites up to 599 BST in Kaizo, Survival and Super Kaizo, or 640 BST in Standard and Ultimate. However, because the Tracker only shows 3 favourites, you may use the Welcome Message to show the rest.
  • Example:
  • NOTE: Having a Pokémon as a favourite only counts for that specific form. For example, if you have Arcanine as a favourite, this only applies to Kantonian Arcanine, not Hisuian Arcanine. You may have multiple forms as favourites.

Edit 24/Jul/24: Super Kaizo BST limit was increased to 599

List of banned Pokémon in Standard and Ultimate

Mewtwo, Lugia, Ho-Oh, Slaking, Kyogre, Groudon, Rayquaza, Dialga, Palkia, Regigigas, Giratina, Arceus, Reshiram, Zekrom, Kyurem, Xerneas, Yveltal, Solgaleo, Lunala, Zacian, Zamazenta, Eternatus, Koraidon, Miraidon, Mewtwo-X, Mewtwo-Y, Tyranitar-M, Salamence-M, Metagross-M, Latias-M, Latios-M, Garchomp-M, Diancie-M, Rayquaza-M, Kyogre-P, Groudon-P, Dialga-O, Palkia-O, Giratina-O, Kyurem-W, Kyurem-B, Zygarde-C, Hoopa-U, Necrozma-DM, Necrozma-DW, Necrozma-U, Zacian-C, Zamazenta-C, Eternatus-E, Calyrex-I, Calyrex-S, Palafin-H, Terapagos-S

List of banned Pokémon in Kaizo, Survival and Super Kaizo

All of the above, plus:

Dragonite, Mew, Tyranitar, Celebi, Salamence, Metagross, Latias, Latios, Jirachi, Deoxys, Garchomp, Heatran, Manaphy, Darkrai, Shaymin, Victini, Hydreigon, Landorus, Meloetta, Genesect, Goodra, Zygarde, Diancie, Hoopa, Volcanion, Kommo-o, Necrozma, Magearna, Marshadow, Zeraora, Melmetal, Dragapult, Zarude, Baxcalibur, Archaludon, Pecharunt, Venusaur-M, Charizard-X, Charizard-Y, Blastoise-M, Alakazam-M, Gengar-M, Pinsir-M, Gyarados-M, Aerodactyl-M, Ampharos-M, Steelix-M, Scizor-M, Heracross-M, Houndoom-M, Sceptile-M, Blaziken-M, Swampert-M, Gardevoir-M, Aggron-M, Lucario-M, Gallade-M, Goodra-H, Deoxys-A, Deoxys-D, Deoxys-S, Shaymin-S, Landorus-T, Meloetta-P, Greninja-A, Wishiwashi-S, Terapagos-T