Below are the Pokemon in the order Charizard, Pikachu, Jigglypuff, Lucario, Greninja:

19 06 00 00

19 19 00 00

19 27 00 00

1a c0 00 00

1b 92 00 00

It would appear from the previous findings that these characters are all from different series, but that is actually not the case. For the Pokemon, the second byte represents a simple number, and the first byte represents a multiple of 256 to add to that number, with 19 being 0, 1a being 1, and 1b being 2 (512).

When you convert the hex to decimal and add the 256s, you get some oddly familiar numbers:

06 from hex = 6, 6 + 0 = 6

19 from hex = 25, 25 + 0 = 25

27 from hex = 39, 39 + 0 = 39

c0 from hex = 192, 192 + 256 = 448

92 from hex = 146, 146 + 512 = 658

These are the Pokemons' corresponding National Pokedex numbers. This means that there is space reserved for all 700+ Pokemon.

tl;dr: pokemon amiibos