Squad represents an optional additional cost that you may choose to pay any number of times as you cast the card with squad
Then again, it recently got reprinted in Murders at Karlov Manor , which made the price drop significantly
On their turn, a player can place a single energy on a Pokmon, perform an attack with an active Pokmon, play Pokmon onto their bench or play item or trainer cards from their hand
This mechanic is the perfect way to represent the classic Summons from Final Fantasy (also variously known as Espers, Aeons and Eidolons depending on the series entry)
(Full disclosure: that's bias on my part, to be sure, as I'm a long-time Gruul rage-freak
Trample is an effect that causes excess damage done to a creature gets done to a player instead