should i buy pokemon cards individual Pokémon or packs? First time buying Pokemon cards

Child of Alara AND Garth One-Eye Just 99 and 75 cents respectively

Card Set(s) -Worst Generation-[ST-02] CARD VIEW ST02-011 | C | CHARACTER Heat Attribute Special Block icon 1 Card Set(s) -Worst Generation-[ST-02] CARD VIEW ST02-012 | C | CHARACTER Bepo Attribute Strike Block icon 1 Card Set(s) -Worst Generation-[ST-02] CARD VIEW ST02-013 | SR | CHARACTER Eustass"Captain"Kid Attribute Special Block icon 1 Type Supernovas/Kid Pirates Effect [Blocker] (After your opponent declares an attack, you may rest this card to make it the new target of the attack.) [DON

You can always keep a couple of cards around that exile graveyards if needed though, like Bojuka Bog

Its playable in some Constructed MTGA formats as a burn piece and does well in that role