This challenge is doable ONLY under sunny weather boost condition. Since the new level cap for Pokemon is level 52, meaning some of the tier-5 bosses can be done by duo (which previously has to be trio), or even solo, provided that Pokemon has double weakness.
Genesect's only weakness is fire, & it is double weak to it. I am up for a challenge to take it down under 1 vs 1 condition. Not the fastest time in terms of solo, the current record is 270 seconds for solo to take it down.
Genesect's move: Metal Claw+X Scissor
Mega Charizard Y's move: Fire Spin+Blast Burn
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