There are a lot of missing nexomons, especially the final numbers. I guess they're either secret or legendaries. The game is apparently getting updates so they might be added later or be dlc.
I'm 99% sure that belossom redesign is inspired on a classic portuguese/brazilian star Carmen Miranda. The "fruit turban" makes it pretty obvious.
Any brazilian person would be able to tell you is a very iconic look. She was also popular in the US to at the time.
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The design itself could be better but... it's a pretty clever re-design, going from hula hula dancer to samba dancer. I kinda like it more than default bellossom. At least one person on their art team is a man of culture.
The rest on the other hand is pretty bad lol. Why does furret have a NEON GREEN "scarf" appendage and Marill looks like a normal rat wearing a costume? They took some of the cutest pokemon and made them ugly as hell.