Question

How come thunder only targets one opponent and not both of the opponents?

Comments

Gonna go out on a limb and say that it would probably be kinda overpowered if it did...

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It was hard enough for Thunder to hit one target, you want it to hit two?

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God wanted it that way. It is his main charge.

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Very funny. Anyway, the description implies a single thunderbolt, and it's hard to make one thunderbolt hit two moving targets.

Answer 1

The game descriptions for it all describe it as "a lighting attack" or "a wicked thunderbolt", which means that only one thunderbolt would be dropped at a time. Thunder also has base 110 power, so if it hit both targets, it'd be pretty overpowered.

Or maybe Gamefreak just wanted it to only hit one opponent for some unknown reason.