dream 
TAKING A BREAK
I agree with Gyro :P It's very easy to do -(pokemon name) if you don't want to see it, and it's easy to remove implied tags if they don't fit. Personally, if I'm searching for pictures of foxes, I want to see all pictures of foxes, including fictional fox species like Ninetales and Fennekin.
And like it was stated, it's a lot easier for someone to remove "pokemon" from their search than for someone looking for birds to have to add "OR (bird pokemon) OR (another bird pokemon)", so on, for each bird pokemon xP
(Also I'm pretty sure Charizard isn't a dragon type because dragon was insanely overpowered in gen 1 :P. Mega Charizard X is dragon type.)
And like it was stated, it's a lot easier for someone to remove "pokemon" from their search than for someone looking for birds to have to add "OR (bird pokemon) OR (another bird pokemon)", so on, for each bird pokemon xP
(Also I'm pretty sure Charizard isn't a dragon type because dragon was insanely overpowered in gen 1 :P. Mega Charizard X is dragon type.)