I will look into this in the future. I would like to support Bulbapedia, Serebii, and PokemonDB (user options for which they prefer).

Biggest problem I see is where to add these links. For the time being I’m thinking about the right-click/long-press menu.

I agree, the right-click/long-press menu is the best place for it. That way it’ll be easier (I hope) to dynamically generate the URLs. We should make sure to have the links open in new tabs though.

Dynamically-generating links to Bulbapedia and PokemonDB seems trivial for English, but Serebii will need some more serious work since there’s an entry for each pokemon for each game it is in.

Simplest solution is to know each generation, know which pokemon is in which generation, and then map the URLs appropriately, but I didn’t look into this very deeply.

We could potentially add a new key-value pair to the JSON for this, with a numeric gen identifier in it.