I will give my reasons, and I am doing this through an inexperianced teenager, not some expert. Also this is prejudice.

Rhydon Reminds me too much of Stadium, I would only use one for Horn Drill and maybe strength
Exploud to hard to raise, I mean if I catch a whismur at the start and train it, I would have Exploud in my team if not screw it.

Hariyama I don't like fighting types too much, and this guy isn't fast enough

Golem Can get killed by surf, ice beam, any grass attack for the most part.

Tentecruel Just too many tentecool and I find it annoying.

Aggron Too slow

Machamp Link cable sucks, if I would want to train a good pokemon why would I want my opponent to see it.

Medicham Exept for huge power, this guy is a pushover.

Electrode No good moves

Sharpedo Weak defences

Muk So Red and Blue

Seviper Although cool, poison sucks

Lunatune/Solrock Um, I don't know, mabye because there are better psychics,

Crawdaunt No good moves and there is better dark or water pokemon out there, also why does it have a high attack but none of its attacks have stab

Pinser Bug pokemon cna get knocked out easily

Donphan Ugly, and I prefer specail attacks over attack.