Closing this. This thread just sounds like a means to cause problems.
As people pointed out, it appeared in more then 8 episodes, don't exaggerate.
There being an episode about Mareep where Emolga didn't appear means nothing. Emolga doesn't have any special connection with Mareep, the writers created the plot of the episode to have Dragonite help Ampharos learn ThunderPunch, Emolga can't do that.
The writers obviously remember it, they wouldn't forget something like a main cast's Pokemon.
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