I've gotten reasonable high up on the ladder after a day in the tier with a virtually no skill team.
pokepast.es/9f364e72d0411e48
The premise of the team is to just get +6 defenses on eternatus with cosmic power and sit there slowly chipping away the enemy team. One thing having multiple abilities helps with is
limiting counterplay. Here's all the ways that one would normally stop a bulky setup sweeper (or in this case, a defensive, passive setup sweeper) :
- Taunt/Encore
- Running them out of pp, specifically recovery
- Crits
- Phasing
- Passive Damage
- Strong Wallbreakers
The team has ways to hinder or completely shut down all these options. Aroma Veil prevents taunt and encore. Harvest + Leppa Berries means an infinite amount of pp, which can't be removed by knock off or tricked thanks to sticky hold. Crits are blocked by shell armor. Phasing can easily be countered by just sacking all your mons first (Unnecessary if they don't have phaser) . Passive damage comes in the form of leech seed and toxic. Etern has the benefit of outspeeding all defensive mons (along with half the tier), and is able to get a sub up in front of leech seeds and possible whatever else. The only way this could be a problem is population bomb + Toxic chain + Corrosion, which can break the sub and badly poison etern, but it is only one pokemon on a rare gimmicky team style to begin with. As for strong wall breakers, they are managable with the help of memento/phasing/screens support, and most lose to etern once it gets set up. Once you do get set up, tera blast to chip down their team and pp stall out attacking moves. If you can't chip down their team because tera blast doesn't outdamage leftovers/grassy terrain/dry skin, set up an autoclicker and spam recover until turn 1000 / ff. Tera steel helps with setting up, and lets etern beat magerna. The team is weak to hazards, as eternatus would have to waste a turn on recover to get back multiscale. Red card on torkoal helps it potentially phase out a ghost type and spin.
Example:
https://replay.pokemonshowdown.com/gen9sharedpower-1986499727-kdrrgwasd39v7xnyp4jp0hhf1j5a5hnpw?p2
How To PP Stall
At +6 defenses, the only real threats that can break through are other setup sweepers. However, with multiscale, this still fails
The following are examples with etern at +6 and the opposing mon at +6
IF YOU ARE FASTER (Ev 329 speed for Chi-yu)
Click sub twice. This forces you opponet to waste 4 pp to break the subs. This will leave your hp at 51%. Use recover to get back multiscale, meaning you take 1/2 damage from the next attack. Keep clicking recover until they run out of pp. You are fine if they do less than 50 percent with one attack.
IF YOU ARE SLOWER (Most notably against shift gear magerna)
Tera steel to resist stored power. Click recover. Magearna will do less than 50% with multiscale, even if it has +6 from shift gear and calm mind.
In the same turn magearna breaks multiscale, you recover and get it back. Repeat.
Threats
Interestingly, the unnerve part of As one only applies to Calyrex Ice itself, meaning that you can still eat leppa berries in front of other members of the team even if the ability is shared. Might get fixed soon. What this means is that if only have one tera blast pp left and calyrex ice is not in range to be koed, it can survive the tera blast, leaving you with no attacking moves and no way to get back pp. Luckily calyrex ice is weak to steel, and your opponent would have to make a lot of predictions to bait out tera blast pp.
0 SpA Tera Steel Eternatus Tera Blast vs. 252 HP / 0 SpD Calyrex-Ice: 192-228 (47.5 - 56.4%) -- 83.2% chance to 2HKO
Perfect blend of tools to counter this team. Swords dance to match boost. Psyblade could potentially 2hko through recover spam, depending on team abilties. Sacred sword for tera steel. Best option against it is to not tera and hope psyblade does less than 50%.