This does not work the way you want it to. The reason Regieleki doesn't run Electro Ball in standard is because you need to be a lot faster than your target, and against the majority of the meta - especially other offensive threats - you're going to be significantly weaker than just running normal moves. Max speed Regieleki hits 548 Speed, and the way Electro Ball's damage is calculated, that means that anything with 274 Speed or higher treats all of its moves as if they're 60 BP. Anything with max Speed investment and base 76 Speed or higher can hit at least 274 Speed. 183 Speed is the minimum for all moves to be 80 BP (which is to say, identical or weaker than the moves you'd run anyways on this set), and that's achieved by anything with at least 74 base Speed even with no investment. 150 BP on all moves requires a Speed stat of 137 or lower, which you're mostly going to find on fat defensive 'mons.And_here_we_are.mp4
The ultimate lifeform of my stupid theorycrafting
electroball (Regieleki) @ electroball
Ability: Transistor
Tera Type: Ice
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
IVs: 0 Atk
- Shock Wave
- Tera Blast
- Ancient Power / Extreme Speed
- Agility / Volt Switch
I made this in a cold sweat in about 5 minutes because this thing is absolutely unfair. If I understand moves like Heavy Slam and the now-restricted Low Kick and Grass Knot, surely Electro Ball has the same implementation. Lo and behold: this thing. Base 200 Spe with all its moves' BP scaling off of that, coupled with espeed (assuming you would run mixed in the first place) to potentially nail opposing priority which could check this monster.
some calcs which scare me (based off EVs in this thread):
Shock Wave
Tera-Ice Blast
- 252 SpA Transistor Tera Ice Regieleki Shock Wave vs. 252 HP / 252+ SpD Toxapex: 344-408 (113.1 - 134.2%) -- guaranteed OHKO
- 252 SpA Transistor Tera Ice Regieleki Shock Wave vs. 252 HP / 252+ SpD Garganacl: 237-279 (58.6 - 69%) -- guaranteed 2HKO
- 252 SpA Transistor Tera Ice Regieleki Shock Wave vs. 252 HP / 252 SpD Tyranitar: 241-285 (59.6 - 70.5%) -- guaranteed 2HKO
- 252 SpA Transistor Tera Ice Regieleki Shock Wave vs. 248 HP / 8+ SpD Florges: 190-225 (52.9 - 62.6%) -- guaranteed 2HKO
ExtremeSpeed
- 252 SpA Tera Ice Regieleki Tera Blast vs. 252 HP / 4 SpD Iron Treads: 271-321 (70.5 - 83.5%) -- guaranteed 2HKO
Curious as to how this zappy themster will be handled
- 4 Atk Tera Ice Regieleki Extreme Speed vs. 252 HP / 4 Def Blissey: 446-525 (62.4 - 73.5%) -- guaranteed 2HKO
Some amendments:
252 SpA Transistor Regieleki Electro Ball (120 BP) vs. 252 HP / 252 SpD Tyranitar in Sand: 129-153 (31.9 - 37.8%) -- 91.1% chance to 3HKO
252 SpA Transistor Regieleki Electro Ball (80 BP) vs. 248 HP / 8+ SpD Florges: 102-121 (28.4 - 33.7%) -- 96.9% chance to 4HKO after Leftovers recovery
252 SpA Tera Ice Regieleki Tera Blast (60 BP) vs. 252 HP / 4 SpD Iron Treads: 109-130 (28.3 - 33.8%) -- 0.9% chance to 3HKO
4 Atk Regieleki Extreme Speed vs. 252 HP / 4 Def Blissey: 357-421 (50 - 58.9%) -- guaranteed 2HKO
You also lose a lot of 2HKOs on reasonably bulky offensive 'mons like Annihilape and Chi-Yu. Also, not really relevant, but you'd be completely toothless against anything with Bulletproof.