Those were some good games, but your Pikachu isn't irritating as some others I've unfortunately seen.
I'm going to regret this, I just know it, but 2 things to make people hate the ever loving **** out of a Pikachu player:
1. Spam down smash.
2. Ledge guard by standing on the edge and using down+B.
Win or lose, you'll have opponents hurling obscenities and controllers in no time.
Also, I wish the lag was better than this. I feel I'm gaining an advantage by using a character with natural lag anyway, since I don't think Bowser is as affected as faster characters.