They may have resistance to Psychic, Fighting, Fire, Grass or Water-types, depending on if they are a Normal, Flying or Dragon-type Pokmon (and the specific card)
It also wouldnt hurt if all the characters were extremely sexy
The goal of the deck is to play creatures and slap counters on them with cards like Maester Seymour then reward you for doing so, drawing you cards with Bred for the Hunt, giving them keywords with Sphere Grid, or protecting them with Inspiring Call, all while your creatures to continue to grow and bash in for more damage
Id recommend taking your time to think about each card as you build your deck so you dont get tripped up by these technicalities
Its especially strong in Commander, where repeatable upkeep triggers scale naturally in multiplayer settings