what tentacruel? The one I had in my party?
A blast-from-the-past for me. I used to use one on my competitive team. It didn't help much so I shelved it. I wanted to breed a better one, just in case I need one later.
Also, you messed up the defense. You gave it 255 evs, which makes me unable to use the 4 evs for something else. It's alright though. It will be very easy to fix it. Just battle 16 geodudes ^^