Torkoal

Torkoal has good moves but is limited by its poor stats. Though defensively oriented, Torkoal has a bad defensive typing and charge moves that are trivial to dodge. It doesn’t help that it’s a regional exclusive.

Best PvE Offensive Moveset

• Fire Spin is strictly superior to Ember.
• Overheat is preferred due to its raw power and synergy with Torkoal’s fast moves.
• Solar Beam suffices in neutral matchups, Earthquake is awful without STAB, and Flame Wheel is just inferior on offense.

Best PvE Defensive Moveset

• Fire Spin is strictly superior to Ember.
• Torkoal’s charge moves are easy to dodge, but Solar Beam has counter coverage.
• Flame Wheel is Torkoal's only multi-bar move, so it definitely has value. However, it leaves Torkoal easily walled by anything that resists Fire.
• Overheat, if it hits, will deal hefty damage; Earthquake is okay as well.

Fire Spin is superior to Ember due to slightly better energy gains. 

The update to Overheat following the Dec 11, 2019 rebalance improves Torkoal's speed to access its charge moves and allows Torkoal to threaten a very powerful attack sooner. However, the -2 ATK debuff on the user makes it more tricky to use. Earthquake gives some good coverage, though it does cost quite a lot of energy. This turtle’s expensive moves define him as a designated anchor, only to be used when shields are down (and ideally when you have at least one still available). 

If you want to go all in on super expensive moves that you’ll likely only be able to fire off one of, Solar Beam can work to give you some coverage against any Rock, Water, or Ground-type Pokémon that would otherwise threaten Torkoal.