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If the creature you control targeted by the target spell or ability leaves the battlefield, that spell or ability is no longer a legal target for Siren Stormtamer's ability

If you defeat an opponents active Pokmon and they have no available Pokmon on their bench to replace it, you can also claim victory

The third great time to be without a color is right here, right now

The only time you would want to move an energy card from Espeon to a benched Pokemon when using Morning Sun would be if Espeon is going to be knocked out the next turn or you plan on retreating Espeon the next turn that way you can presumably place that energy card on the Pokemon you are bringing into your active Pokemon spot that next turn