Pacharisu is actually not all the way bad. He can be used as a stat breaker for opposing pokemon.
Pacharisu can use thunder wave to break a pokemon's speed. He can also use charm to break attack pretty fast. On top of good defense and spec defense, his speed is good, so electro ball will be powerfull, expecially if the foe is paralized. Use Pacharisu to hinder an enemy's stats and then use another pokemon, to set up. I.E your Gardevoir with double teams and calm mind. Parcharisu is very useful if you give him a try.