But you’re forced to use your once-per game Terastallization to get said coverage. That’s big. And 70-80 is still weaker than Surf, Thunderbolt, the aforementioned Icicle Crash, etc.
I’ll count up moves per type/category and see if it really would be the best widespread move in about half of them but I wouldn’t think so, with stuff like Sludge Bomb, Ice Beam, arguably Flare Blitz existing. Really the only things I can think of are special Fighting and physical Electric. Maybe physical Flying if you say Brave Bird doesn’t have enough distribution and Dual Wingbeat is worse?
To follow up on that post:
Normal physical: Body Slam, arguably Double-Edge
Normal special: Hyper Voice, Tri Attack
Fire physical: Fire Punch comes close, arguably Flare Blitz
Fire special: Flamethrower, Heat Wave, Lave Plume, arguably Overheat
Water physical: Liquidation, Waterfall
Water special: Surf, Scald
Grass physical: Leaf Blade, Seed Bomb
Grass special: Energy Ball, Giga Drain, arguably Lead Storm
Electric physical: Thunder Punch comes close, arguably Wild Charge
Electric special: Thunderbolt, Discharge, arguably Thunder
Ice physical: Icicle Crash, Ice Punch comes close
Ice special: Ice Beam, arguably Blizzard
Fighting physical: Brick Break and Drain Punch come close, arguably Close Combat
Fighting special: arguably Focus Blast
Poison physical: Poison Jab, arguably Gunk Shot
Poison special: Sludge Bomb, Sludge Wave
Ground physical: Earthquake, Stomping Tantrum, DrilRun
Ground special: Earth Power
Flying physical: Dual Wingbeat comes close
Flying special: Air Slash comes close, arguably Hurricane
Psychic physical: Zen Headbutt
Psychic special: Psychic, Psyshock, Extrasensory
Bug physical: Leech Life, Lunge, X-Scissor
Bug special: Bug Buzz
Rock physical:
Rock Slide, arguably Stone Edge (edit: wait Rock Slide only has 75 BP? Okay I guess physical Rock goes on the list but Stone Edge is still just as good as 80 BP Tera Blast, actually statistically it has equal average BP and higher crit chance)
Rock special: none really
Ghost physical: Poltergeist
Ghost special: Shadow Ball
Dragon physical: Dragon Claw, arguably Scale Shot
Dragon special: Dragon Pulse, arguably Draco Meteor
Dark physical: Knock Off
Dark special: Dark Pulse
Steel physical: Iron Head
Steel special: Flash Cannon
Fairy physical: Play Rough
Fairy special: Moonblast, Dazzling Gleam
All of these have equal or higher (or extremely close in the case of the Punches and Air Slash) power than 80, very good distribution among Pokemon of their types, and no major accuracy/recoil/stat drop drawbacks (except for the “arguably” ones) with some rarer moves like Triple Axel and Brave Bird also being as good. And yes, some of these aren’t common as coverage, but
once you’re Terastal, it isn’t coverage: it’s a STAB move.
So overall, the only type/category combos that lack widespread moves stronger than an 80 BP Tera Blast (disregarding “comes close” and “arguably”) are physical Fire, physical Electric, physical Ice if you don’t count Icicle Crash as widespread (a bit more than half of Ices learn either it or Triple Axel), physical Fighting, special Fighting, physical Flying, special Flying, and special Rock, only 8 of 36 type/category combos, and let’s be real Flare Blitz and Close Combat are better than 80 BP Tera Blast, with the 75 BP moves being pretty much just as good. Also note that I said 70-80, so a 70 BP Tera Blast would trim down all but special Fighting as type/categories that lack a widespread alternative. Actually the Punches don’t have
that good distribution but it’s significant enough.