Heracross

Heracross has a unique Bug/Fighting typing that would not be seen again until the Ultra Beasts in Sun/Moon. As a Bug-type attacker, Heracross is both outclassed and not viable for tasks such as soloing Alakazam. As a Fighting-type attacker, Heracross is still outclassed, but it’s a great choice for tasks that require lots of pugilistic power.

Heracross frequently appears in gyms, either to show off or to help a player farm candy, but its defensive prowess is poor, being weak to and resisted by many types.

If you're lucky enough to have a good Heracross outside of its native range, then definitely hold onto it. Mega Heracross is an absolute monster.

Best PvE Offensive Moveset

• Counter should be paired with Close Combat to make Heracross a decent Fighting attacker.

• Struggle Bug can be paired with Megahorn for Bug-type offense, but there are better options in this role.

• Rock Blast can add some versatility for attacking Gyms as a secondary move, but is otherwise not very useful. 

• Earthquake is outclassed by Heracross’s other charge moves.

Best PvE Defensive Moveset

• Struggle Bug performs better than Counter, but is resisted by many types that would attack Heracross.

• Rock Blast is the only multi-bar move available, and its Rock typing is also very valuable against Flying-type attackers. 

• The rest of the available Charge Moves are 1-bar moves. Close Combat, Megahorn, Earthquake is the order of preference.

Counter is a solid move in PvE thanks to its high damage and decent energy generation. Struggle Bug is horrendous.

The addition of Rock Blast following the GBL Season 9 update is very appealing for Heracross due to its low energy cost and useful Rock-type coverage, especially against Heracross's weakness to Flying-types. Close Combat enables Heracross to perform more consistently as a Fighting-type and threaten massive damage. Unfortunately the -2 Defense debuff on the user makes it risky to use, which is not very comforting when considering the limited bulk of Heracross. Megahorn hits hard and isn't terribly energy-intensive to use. It also grants Heracross an invaluable Bug-type STAB to help it take down many of the Pokemon that it's generally chosen to counter. Earthquake is a strong move that provides wide coverage, but is also the slowest option.