give them exp/stat boosts akin to self-fusions.
change their typings coz their double/triple types are spreading into Hidden Power and it's bad and creating so many weaknesses above 4x.
change the abilities too.
• Zapdos Moltres Articuno, Flying/Normal
Serene Grace, Protean, Pressure HA
• Entei Raikou Suicune, Normal
Speed Boost, Color Change, Pressure HA
• Kyogre Groudon Rayquaza, Ground/Water
Drought, Drizzle, Sand Stream HA
• Palkia Dialga Giratina, Normal/Dragon
Levitate, Color Change, Pressure HA
• Zekrom Kyurem Reshiram, Dragon/Normal
Mold Breaker, Protean, Pressure HA
• Celebi Mew Jirachi, Psychic/Normal
Serene Grace, Color Change, Protean HA
• Deoxys Genesect Mewtwo, Psychic/Steel
Download, Protean, Pressure HA
• Venusaur Blastoise Charizard, Poison/Flying
• Meganium Feraligatr Typhlosion, Normal
• Sceptile Blaziken Swampert, Fighting/Ground
• Torterra Infernape Empoleon, Ground/Steel
and also give all of them Tri Attack as a starting move in the movepool