In Pokebase, it suggests tags that are words from the titles of questions that the site assumes to be related. It does not suggest tags that are words in the question itself. This is very annoying because the tags often have nothing to do with the question that I'm trying to ask.
EDIT: Suggestion: include as many tags as possible that use words that show up in the question title.
This is due to a limitation in the software. It's most likely due to the fact that the title should contain the most appropriate words for the question, while the content of the post can include all sorts of stuff like URLs, Markdown code, or HTML code if the site was using a HTML editor instead of Markdown.