Needs snarl, chilling water, and healing support.

Typhlosion-Hisui @ Shell Bell
Ability: Any
Tera Type: Fighting
EVs: 172 HP / 152 Def / 88 SpA / 96 SpD
Modest Nature
Tera Blast
Calm Mind
Defense Curl
Rest

Vitamins: 17 HP Up (or Health Mochi), 15 Iron (or Resist Mochi), 8 Calcium (or Genius Mochi), 9 Zinc (or Clever Mochi)
Feathers: 2 Health Feathers, 2 Resist Feathers, 8 Genius Feathers, 6 Clever Feathers

Stats at lvl 100 w/ perfect IVs:
HP : 330
Defense : 230
Sp.Atk.: 325
Sp.Def.: 230
Speed : 226

Support Requirements : taunt and snarl to cancel nasty plot and reduce damage from supereffective special tera blast pre-tera. chilling water to cancel swords dance and reduce damage from supereffective physical tera blast pre-tera. healing (e.g. life dew).

Strategy: wait for orb steal, and for ally to get infernape's attack to -1 and special attacker to -1. defense curl, nasty plot, heal cheer when ally needs HP. rest when HP is low. 3x tera blast, terastalize, 4x calm mind, tera blast to victory.

Pros: supereffective tera type, decent HP, defense, and special defense stats. excellent special attack stat, resists flare blitz and grass knot before terastalizing, immune to aura sphere before terastalizing, resists tera blast after terastalizing, defense curl buffs defense 1 stage. calm mind buffs 1 special defense stage and 1 special attack stage. tera blast has 80 base power, 100 accuracy, and deals supereffective STAB damage when terastalized. rest heals full HP bar.

Cons: tera type mismatches base type, weak to tera blast before terastalizing. tera type mismatches base type. outsped by infernape

Overall Rating: 7/10