Fighting/Psychic deck

My brother just made his first Unlimited deck and wanted me to post it for it to be rated.

Pokemon x15
2-1 Hippowdon (Diamond and Pearl)
2-1 Rhydon (Diamond and Pearl)
2 Onix (Diamond and Pearl)
1-1 Grumpig (EX Crystal Guardians)
1 Spoink (EX Dragon)
1 Tauros (EX Crystal Guardians)
1 Hitmonchan (Neo Destiny)
2 Machop: (Team Rocket)

Trainers x11
1 Master Ball
2 Poke Ball
4 Energy Search
1 Pokedex HANDY910is
2 Potion
1 Switch
Pokemon Tools x3
1 Amulet Coin
2 Buffer Piece

Supporters x7
1 Buck's Training
1 Rival
3 Professor Elm's Training Method
2 TV Reporter

Energy x23
17 Fighting
7 Psychic

I dont really think this is a bad deck... maybe add a machoke?

What's your deal with two buffer pieces?

I think the 2 buffers are quite OK

I don't get his strat. He should add a Rypherior since Rhydon is there. + buffer piece would've made the deck more intim.

Yea I guess...Maybe he's looking for a rhyperior..
But 2-1-1 is not that great...

One more thing, you need a Hipopotas before a Hippowdon right?

In answer to the questions I found scattered into that convesation:
The Buffer Pieces provide defence to his all-out attacking Hippowdon.
I think Rhyperior would be a poor choice for the deck. So does he.
Yes, you do need Hippopotas before Hippowdon. "2-1 Hipowdon (Diamond and Pearl)" means 2 DP Hippopotas and 1 DP Hippowdon.