Does it bug anyone else how a lot of newer legendary and mythical Pokemon are restricted to being at higher levels?
Was thinking of replaying Ultra Moon and, having used nearly all of the Alola Pokemon already, I was thinking of using Poipole or Type: Null, but they're both restricted to being at level 40. And since they can't be bred, that's all you get.
When I replay Pokemon games I often like to use late-game Pokemon like Clamperl and Bagon (partly for the novelty, partly for the challenge). I've occasionally also done solo runs with mythicals like Mew or Celebi since they can be gotten as low as lv5. But this seems to be less and less possible as time goes on. Gen V was the last gen in which the developers seemed to be encouraging you to use mythicals as part of your team if you wanted to - Victini, Keldeo, Meloetta, Genesect were all available as low as lv15. I actually did use Keldeo as part of my team of six when I first played Black 2 but haven't used any of the others, though I appreciate having the option.
Looking at the more recent mythicals, it does seem like this is a deliberate design choice:
Diancie - never available lower than lv50
Hoopa - the exception, was eventually released at lv15 during Gen VII
Volcanion - never available lower than lv70
Magearna - never available lower than lv50
Marshadow - never available lower than lv50
Zeraora - never available lower than lv50
There are still a number of standard legendaries, like Mewtwo, the legendary birds, Cresselia, and the Tao trio, that aren't obtainable at lower levels, but but many that are, like the legendary beasts, the Regis, and Zygarde (all available at lv30), Ho-oh, Lugia, and the Forces of Nature (all available at lv5) and the space/time trio (all obtainable at lv1). I'm honestly unsure if there's any rhyme or reason why some legendaries are gated to higher levels while others aren't, but at least most of the standard legendaries have story significance which necessitates them being incredibly high-levelled.
My gripe is that doing this with mythicals makes a lot of these Pokemon (many of which are already fairly uninteresting) feel even more so since there is almost no incentive to actually use them as part of your team (unless of course you play in battle formats which allow uber legendaries - I don't). Assuming that you receive them before you've finished the game, they're far too overpowered (and won't obey you anyway) and can't be used in battle facilities. Virtually all of the post-gen V mythicals have been received and plonked straight into my PC, never to be touched except for when I need to transfer them over to the next generation's storage system.