Like most Pokmon cards, the value of Giovanni's Machop depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Gym Challenge)
For example, if an effect refers to equipped creatures you control, it wouldn't count another creature you control that doesn't have an Equipment attached to it, even if Solaflora is equipped
Bonus Pick: This Wonder Pick costs 0 Wonder Stamina and contains at least 1 Pokmon card and items (Pack Hourglasses, Wonder Hourglasses, and/or Shop tickets)
Im happy to talk about the reasons I ranked them this way
712.21e If an effect needs to know the number of objects that changed zones, a melded permanent among those objects counts as one object that moved
Even if you open a brand new pack from the latest Pokemon TCG set, there is a not insignificant chance that the cards you open will have some sort of scuff, mark, or damage to them