Johto : Ash's Charizard, Harrison's Blaziken And I'm sure Jon Dickson has a very strong one
HM : Ash's Snorlax, Gary's Blastoise
Hoenn : Meowth, Swellow, Pikachu
HM :Tyson's Metagross, Morrison's Steelix
Sinnoh : Darkrai, Infernape and Sceptile
HM : Paul's Drapion, Paul's Elecivire
Unova : Some Eeveelution, Ash's Pikachu, Cameron's Hydreigon
HM : Cameron's Lucario, Trip's Serperior, Ash's Krookodile
Kalos : Trevor's Charizard
HM : Pikachu, MCX, AG, MScept, Bisharp
Alola : Tapu Koko, Ash's Pikachu, Guzma Golisopod
HM : Kukui's Incineroar, Ash's Torracat