I was thinking of making a defensive Magearna set that can compress a lot of roles, but I'm not sure what to compromise on. Here's roughly what I have in mind:
Magearna
Leftovers/normalium-z
Undecided nature (lots of slashes)
252 HP / 252 DEF / 4 SPD OR 252 HP / 4 DEF / 252 SPD OR some mix of defensive investment
- fleur cannon / iron head
- heal bell / pain split
- heart swap
- iron head / pain split
I'm looking to use this set to check Mega Mawile, Hoopa-U, and Lele. Max defense would allow Magearna to switch in on branded Hoopa without being demolished if it goes for fire punch (does over half, but can be brought back with wish support. Since only banded 2HKOs, you can switch to something the takes fire punch well). However, this makes you weaker to specs variants, as well as specs Lele. Max special defense allows you to wall special Hoopa and all Lele sets, but makes the Mawile match up less favorable. It has a chance to 3HKO, and Magearna cannot do much back without stealing boosts, and cannot heal much. If it SDs on the switch, and can 2HKO you, even after losing its boost the next turn. I want to run enough defense for Mawile, since there are few defensive checks to it, but the same can be said of specs Hoopa.
Iron head allows Magearna to do decent damage to Mawile, especially after stealing boosts. Fleur cannon is a powerful move that is great after stealing boosts from calm mind users, and you can even heart swap after using it to cripple special attackers. Furthermore, it helps Magearna check Hoopa. Its low pp is a turn off though.
Pain split provides semi-reliable recovery, and heal bell means you don't need it on another member.
So, what I was thinking with this set is that I have been using Muk-A to check Hoopa and Lele. If I can get Magearna to do that and check Mawile, I won't need a Pokemon just for Mawile. I had been using Volcarona for Mawile, which I had to fit defog on because I couldn't get it on another member (bar 1, but I feel 2 are needed). Volcarona doesn't switch in on a whole lot of stealth rockers, and generally doesn't find many opportunities to defog. If I could replace Volcarona and Muk-A with Magearna, I could get a proper defogger. I had used Moltres as a Mawile check, but it was unreliable; it needed almost full health to live thunder punch.
Is it possible to do this with Mawile? I suppose mew may be used as a defogger and Lele check, but Magearna still needs to check Hoopa. Heal bell isn't necessary, but it would ease up the moveset of the wish passer that Magearna mandates.