So I looked up
Rage Fist on serebii just to check this move out and according to them, the move powers up itself if it connects.
It doesn't exactly specify how much its power increases and if it is permanent like when you have been hit or just a thing for the next turn only.
I am going to assume though that this is next turn only.
Now, I have heard in the recentmost blunder video (video timestamp: watch?v=2YFKUHzeHQc?t=323) that they hit a rotom for ~40%,
got burned and next turn they still did ~40%
which would imply that Rage Fist powers up 2x if used consecutively.
If all of that is true, this move merits a ban or at the very least a top spot on the radar (see Edit though).
https://www.serebii.net/attackdex-sv/ragefist.shtml
Battle Effect: |
The user converts its rage into energy to attack. The more times the user has been hit by attacks, the greater the move's power. |
Secondary Effect: |
Move's power raises next turn if the move is successful. |
Edit: Okay, I did some testing on showdown itself. Apparently, you don't get a boost if you use Rage Fist consecutively. Now, this may be either an error in Showdowns code or in Serebii's database.
However, it seems like you get a boost to the Base Power of Rage Fist even when you are successfully hit by status inflicting moves such as Willow-Wisp.
For reference, see this replay:
https://replay.pokemonshowdown.com/gen9ou-1719345131-ctpeerr5zyu6kcs2hwesgzvvwnzcobwpw
Basically, I U-Turned on Annihilape to power up its Rage Fist to 100 BP. Rotom takes about 30% unburned.
Then, I hit Will-O-Wisp on Annihilape, which should cut its physical damage output in half, so the expected damage of burned Ragefist is 15%.
However, the real damage is ~22% which means that Will-O-Wisp counted as a hit and powered up the move's Base Power to 150.
It now only seems to be half the trouble, but considering that the Bulk Up + Rest set is very much a thing on this pokemon, this means that there is almost no way of playing around the move other than Switching in a normal type, which gets blown up by Close Combat or Drain Punch.
Everything you would normally do to limit the damage output of this pokemon is being punished by Rage Fist.
And who knows what else powers it up (I am currently testing for pain split, toxic,
haze,
hazards,
rocky helmet/rough skin and stat lowering status moves) .