Should 'real_pokemon' and 'realistic_pokemon' be both aliased to 'realistic' or just alias one pokemon tag to the other and add 'pokémon' and 'realistic' as implication?

I agree I see no point in having those tags.

Agree also. I asked what "real_pokemon" becomes an alias of "realistic_pokemon".
Pokemon fans all have the same right to differentiate the pokemon modified and those drawn in a realistic style, so "realistic_pokemon" will suffice.

For the tag "real" it will delete it manually but it will not take long.
I will also talk with the user that uses these tags.

I note that real_pokemon and realistic_pokemon are now aliases realistic.
A choice of less appropriate if one can afford for now, the results on realistic some people have more sense...

The tag "realistic" was originally used for the pictures give an impression of realism as in this example: http://e621.net/post/show/39360/

Already that the definition of a realistic pokemon is more than questionable, now pokemon mixes with pictures that have nothing to do.

The staff of e621 to recruit a Vulcan Officer because the system tag lack a lot of logic ^^

Peace & Prosperity.