I don,t think Tera makes Magearna more broken than it already is. Like yes, its an offensive Pokemon that can change type to overcome checks... but every offensive Pokemon can do that.
Magearna has the best defensive typing in the game. Any typing it changes to, its objectively worse on the defensive side outside of specific scenarios (which will be the ones in which it Teras, of course) and makes it easier to Revenge Kill Magearna.
Its already a Broken Mon without Tera, Tera just adds extra options to it. Without Tera it could still break Clodsire with Ice Beam, Skeledirge with Shadow Ball or Iron Moth with Psyshock, just not all 3 at the same time.
I mean you can think that but it's not very correct- you said yourself that it can't check those 3 mons at the same time, meaning that w/o Tera there's 2 checks right there if locked into the wrong move.
Shadowball and Psychock are p meme worthy when it comes to a specs set.
This will be the most viable set as it always has been
Magearna @ Choice Specs
Ability: Soul-Heart
Tera Type: Who Cares
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Fleur Cannon
- Volt Switch
- Trick
- Focus Blast
There are some slight variations of this but let's get the S-ball and Psyshock stuff out of serious discussion- you're almost never going to click them.
The free slot might be Trick/FB but that's subpar, but if you had to drop one ur not replacing it with S-ball or Shock..
Mage isn't some insanely broken mon, the question is if it's too strong for OU and some of us think it might be fine since we have a massive power creep and each set has an answer.
The only time its answers to it's multiple sets are checked are w Tera. The only time you can't revenge it with certain mons is Tera.
Stored Power is not a set you can splash on every team and have a day. It needs a careful team around it and good plays to wear down checks. Its probably the set that needs more skillful play to make it work, even though that when it does work its quite infuriating to lose against.
Stored Power Magearna is healthy, if that was the only set it used, it would be a fine Mon.
The problem is that it has 4423232 other Sets, Specs being the most dangerous one.
SP is easily its most unhealthy set.
Screens + Rilla (optional) + SG/CM/Draining Kiss is what pushed it into ubers last gen.
Specs is no joke, but then again neither is Specs Val, Specs Gold, Specs Wake, etc.