Replication Specialist is a nice value piece, but its wild to see this effect at uncommon after seeing Bramble Sovereign at mythic a few years ago
Its ability, Fleet-Footed, lets you draw a card once per turn when it is in the active spot, which encourages to you either actively be swapping it in and out of the active spot, or to power it up to be your main attacker
Pikachu ex has emerged as the strongest deck in Pokmon TCG Pocket's early days, as players can potentially set up a 90 damage attack in just two turns
On top of that, Hitmontop has the ability to deal 20 damage to the opponent's Active Pokmon and one of their Benched Pokmon, which can easily help secure picks that were desperately swapped off the battlefield
Supporter Trainer cards are among the strongest cards in the Pokemon TCG, and being able to use Meowth ex to search out any Supporter card from your deck grants a particularly strong edge to many decks
Demonic is also just a single cards worth of quality, something like a Serum Visions or the Top can set you up with more ongoing quality