Probably not. Heliolisk is outclassed by other electric type special attackers like Tapu Koko, Raikou, Thundurus-T, and some Rotom forms. Tapu Koko is faster and has Electric terrain to make up for inferior special attack, Raikou has better stats and access to Calm Mind, Thundurus-T has better special attack, typing, and ability as well as access to Nasty Plot, and Rotom has Levitate to eliminate its ground weakness and better dual typings than Electric-Normal.