Well, there is still the second reason for it, but I figure you're right. And for the reason behind her attacking her own teammates, I figured the bio explaining how she loses control along with it explaining, right in the target field, how the target is random, explained it clearly enough
Mind if I try to start on the evolution's sig move and run it pass you through pm (as it is WAY too strong for a Pichu)? After all, it will take me awhile to get everything right for it
Pichu (F)
Signature Attribute: Electric Reserve
Description: Pichu's, as we know, discharge energy very easily when startled. Of course, this discharge likely does very little if it happened within battle. However, if one learned to control these discharges and instead store up energy, then it may end up being quite powerful indeed. That is what Pichu did. She, through practice, learned how to store up her energy. This energy remains within her until she is weakened too much to keep it in anymore. At this point, she lets it all out, and her fur, almost like a Mareep's, absorbs it. As such, any contact made with her causes the electricity to jump to the opponent. This electricity goes beyond a Pichu's normal static ability, however, being the kind used to attack. Combined with the static that naturally occurs in the fur, and it causes it to be quite nasty. The electricity is so lively that it even jumps to special attacks that Pichu may use! However, all this energy is not good for anyones health, and as such, it continually harms Pichu. It doesn't help as they hurt themselves with electricity easily, as it is stated even in their Pokedex entries. Also, due to the constant zapping occurring, it makes it nearly impossible to just calm down and chill. Another problem with the zapping is that it makes it slightly harder to concentrate, causing more energy to be used just to ignore the pain and use an attack.
Effects: Pichu, upon going under 33% health, starts doing an extra 2% electric-type damage for every attack made, whether electric type or not. Also, all of her physical attacks have a 5% chance of paralysis if they have no secondary effect already. As a cost, however, all attacks cost an extra 1% energy to perform, along with Pichu receiving 1% damage, whether attacked or not, after each action performed. This damage is not affected by Protect or Detect. Also, while this attribute is activated, Pichu cannot chill. Entering a body of water causes the damage done to Pichu at the end of each action to go up to 2% instead of 1%. Also, while in a body of water, all Pokemon within five feet that are also in the water will receive 1% electric-type damage at the end of each action.