Same name. Different card. Different money.
These cards were printed more than once, and the printings are not worth the same. Before asking whether to grade one, it is worth knowing which one you have.
Pikachu
24 printings · $2.00 – $1,393
696×spread
Charizard Holo
4 printings · $70 – $1,097
16×spread
Psyduck
5 printings · $19 – $1,047
55×spread
Mega Charizard X
3 printings · $5.97 – $870
146×spread
Dark Charizard Holo
2 printings · $208 – $670
3×spread
Mew ex
6 printings · $25 – $474
19×spread
Charmander
7 printings · $3.61 – $309
86×spread
Squirtle
5 printings · $3.61 – $121
34×spread
Blastoise Holo
2 printings · $78 – $117
2×spread
Bulbasaur
7 printings · $3.83 – $112
29×spread
Charmeleon
2 printings · $20 – $73
4×spread
Wartortle
2 printings · $21 – $63
3×spread
Ivysaur
4 printings · $8.31 – $44
5×spread
Radiant Charizard
4 printings · $8.40 – $19
2×spread