A rough number would be hard to identify as new signs are being developed all the time. As with any other language, sign language is a living thing that grows and evolves.
more than you can count... how many words are in the English language??
A stop sign has eight sides.
Just one, "the retard", that is you.
30 = 13 are from events, 7 are non legend pokemons (quest rewards), 10 are legends