You cannot officially play Pokemon TCG Pocket on PC, and the game has not been released on any platform other than Android and iOS mobile devices
In terms of power level, most of them would sit roughly between 3 and 5 out of 10, with the more powerful ones coming from Commander 2020
Splitskin Doll For 2 mana and with another creature with power 2 or less in play, you get to draw a card, but I like being able to run this creature in a reanimator or madness deck that can maximize its discard ability
Polukranos, Engine of Ruin Color Indicator: White and Green Legendary Creature Phyrexian Hydra Reach, lifelink Whenever Polukranos or another nontoken Hydra you control dies, create a 3/3 green and white Phyrexian Hydra creature token with reach and a 3/3 green and white Phyrexian Hydra creature token with lifelink
Fans of fright, admirers of apparitions, and devotees of disguise are in for a treat with a curated assortment of cards from the Pokmon TCG: Sword & Shield Series