Board Thread:Support Requests - Designing Your Wiki/@comment-25657959-20190304211856/@comment-168424-20190304221706

There are certain words with colons at the beginning of links that trigger the interwiki link mechanism and pokemon: is one of them (although the list in the help page may be woefully out-of-date).

However, since you're looking at a generated list, this is a bug, since it should not support interwiki linking there, because the list of following links are supposed to only be local links. I would report the bug via Special:Contact/bug.

You can see the interwiki link thing happening here:
 * &rarr; pokemon:Gengar