For starters, parson my spelling, I just woke up.
For the phycics, their abilites are,
for grumpig: own tempo, prevents confusion
starmie: Illuminate, encounter rate increases (I'm not sure what that means, I think it means with wild pokemon)
claydol: Levitate, not hit by ground attaks
Their abilities may or may not vary, I'm just saying what I know they can have.
For the electric one I would go with mageton, it's part steel, wich is it's main attraction, so it has a good defense and a decent attack, on the other hand electrode is very fast. And it will get stuff like selfdestruct.
As for abilities, magneton will know either sturdy, or magnet pull. Sturdy negates 1-hit ko attacks, magnet pull prevents switching in battle. Electron will know soundproof, I'm not sure if there are any other abilities he might have instead. But sound proof avoids sound proof moves, in other words, things like growl and supersonic don't affect it.
It's up to you. I usually go with wichever pokemon I like best. I don't worry about the strongest, maybe you do, but I hope I helped even a littel.