In this case, retro refers to the commonly accepted first era of Pokmon cards, which features the late 90s Base Set and Jungle and Fossil expansions
And of course, the biggest application is to attack with everyone, untap your creatures, and spread the +1/+1 counters around
Fusion summoning is the most basic form of summoning in the game, and lets you pull monsters from the Extra Deck with specific cards
Her second ability acts as a pseudo-board wipe, taking out your opponents smaller creatures and kneecapping their stronger ones
All other Extra Deck Monsters require the Monster to be faceup to use them as material, meaning a facedown Monster is likely going to only be taking up space on the Field
Pokemon TCG Pocket has three different pack variants in Genetic Apex