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However, the Grass-type is still full of powerful options because Teal Mask Ogerpon ex and Hydrapple ex are amazing cards that both make an incredibly synergistic strategy

C Common Guardian Grarl X EARTH Level 5 [ DinosaurEffect ] ATK 2500 DEF 1000 Cannot be Summoned unless you control a face-up "Gravity Axe - Grarl"

12, which requires only 2 materials and has a reasonable hit point, and can permanently gain resistance to destruction during the turn it is activated, which is better as a wall

Bandai says that it was released in September 1996 (It was also said that there was no exact release date left.) In summary The answer of title, Pokemon cards printed earliest is the Pokemon card released before Sep 1996