Mega Tatsugiri is notable for being one of two Mega Pokémon whose appearance changes based on which form it is before it Mega Evolves. The only other example is Mega Magearna, whose differences are so minor that they're probably not worth tagging. As for Tatsugiri, you can easily tell what its base form is by looking at its Mega. When it Mega Evolves, Tatsugiri creates two copies of itself, and the order they're in varies depending on its base form:
- Curly Form: Stretchy on the left, Curly in the center, Droopy on the right
- Droopy Form: Curly on the left, Droopy in the center, Stretchy on the right
- Stretchy Form: Droopy on the left, Stretchy in the center, Curly on the right
This makes me unsure of how exactly it should be tagged. The way I see it, there are five possible options.
1. It is simply tagged as Mega Tatsugiri, without tagging any specific base form(s).
2. Both its Mega form and its specific base form are tagged. As an example, its official art (post #10602618) would be tagged like this:
3. Separate tags are made for each of its three Mega forms, with the general Mega tag being nuked. This is similar to what happened with Gigantamax Urshifu, and would look something like this:
4. Separate tags are made for each of its three Mega forms, but the general Mega tag is not nuked. In my opinion, this is the least ideal option, as the implications would be a mess.
5. No new tags are created, and any art of Mega Tatsugiri will use the Mega tag and the tags for each of its regular forms, since all three are technically present in the Mega's design. This is another one I'm not personally a fan of, though I have seen other users tag it that way. For instance, post #10462741 is tagged like this:
I genuinely do not know what the best approach for tagging this thing is. While there are some options I prefer way more than others, I could see an argument being made for any of them.