Mimi-chanType:
Fire/Steel/DeathAbilities:
Rock HeadBase Stats:HP: 50
Atk: 130
Def: 30
Spd: 140
SpAtk: 80
SpDef: 30
Look at this thing. Look at that smile.
That smile is the last thing many puppets are going to see, because Mimi-chan is easily among the best revenge killers in the game. At a glance, you're going to notice quite a few things in its favor: A staggering 130 Attack, a nearly unmatched 140 Speed, and an excellent ability in Rock Head alongside a slew of moves in which it can be abused. Looking past that though, you notice something else about this screaming harrier jet of death: it has the defensive presense of imported cardboard. Do not let this fool you though; use Mimi correctly and your foes will be crying for mercy.
Instead of listing one set in particular, I'm instead going to go over all of Mimi-chan's options, ranging from viable to tempting but terrible.
Flare Blitz, Head SmashThese two moves should be considered on every set. Flare Blitz reaches 180 BP after STAB and shreds nearly everything that doesn't resist it. Head Smash is equally important as Earth is one of the best attacking types in the game, and having a move that's slightly more powerful than Earthquake is nice, hitting many things that would resist Flare Blitz.
Double-EdgeAnother powerful move, but not always required. If you're afraid of Faith and Ghost types then this is an excellent option, but if the rest of your team can handle them then there's plenty of other things to consider.
ExplosionA staple on most Mimi sets, and one of the most powerful Explosions in the game. The fact that Mimi can use this move is often enough to make your opponent think twice about bringing their ICBM counter in.
Body SlamHeart isn't a bad type at all, but this move is mostly outclassed outside of killing Dark/Reason types. The 30% paralyze rate is a nice bonus that supports the team, but Mimi itself doesn't get to take too much advantage of it due to its blazing speed.
Poison JabI'm normally a huge fan of this move, but Natures have no reason to be switching in on Mimi-chan and many Waters have a subtype that gives them a neutrality or immunity to it. Unless you're highly confident that you're against a foe with a Defense Kaguya or Star Sapphire form, you should probably stay away from using this.
FacadeMimi is immune to Burn and Poison, so the only status left to boost Facade is Paralysis. A Paralyzed Mimi-chan is a dead Mimi-chan, so don't bother with this.
Sky AttackThis move is awesome on paper. You send in ICBM, what's your foe likely to do? Switch. On that turn you charge the move, and then on the next turn you go first, land a perfectly accurate attack with a rockin' neutral type that is almost as powerful as Flare Blitz, have a 25% chance to crit them, and they have a 80% chance to flinch. Then, you finish them off with a coverage move of your choice. Awesome, right? If you can make it work, congratulations. Just watch out for Aqua Jet, Rock Bullet, some Extremespeeds, Flying resists, double switches..
Return, Attract, Coerce, Cotton Spore, Defense Curl, Rest, Swagger, ToxicNo.
Energy Light, Giga Drain, Signal Beam, Weather BallMimi-chan has an acceptable 80 Special Attack in which these moves can be used, but what are you going to use them on? The first two can be used on Earths, but do you really want to leave Mimi in on an Earth?
Now that you've decided on your moves, you need to pick out a nature and EVs. A 4/252/252 HP/ATK/SPD spread is all you should really consider, and the usual natures are Adamant (394 ATK/379SPD) and Jolly (359 ATK/416 SPD). If you're using any special moves you can consider using pretty much any Defense-lowering nature you want since Mimi has irrelevant defenses.
Lastly, your item. Look at your set and what it does, then pick from this list accordingly:
Special Bloomers, Type booster, Lum, Cheri, Focus Ribbon, Salac, Liechi.
Now, let's talk about counters. A counter to ICBM is something that scares it off, or forces it to Explode to get past it. Tenma is a full stop to Mimi's fun; she resists both Flare Blitz and Double Edge while having an immunity to Head Smash. Toyohime forms can take Flare Blitz all day long and only fear the occasional Nature move. Anything that has Rock Bullet or a decently powered Aqua Jet spells doom. Defense Mokou can handle Flare Blitz, but she may not be able to outheal constant Head Smash abuse depending on hold item and sets. From there it's down to things that can take two hits due to their defenses or resists.
USE ROCK BULLET