Yeah Tyrantrum has only worked with Rock Polish for me, tho he has potential with Choice Band in Trick Rooms (especially if his rumored DW is Rock Head).
He's like if Aggron and Druddigon had a baby.
On the GTS I seem to only find people that want lv 70+ starters and legendaries from trading simple pokemon.....greedy bastards.
Don't get me started on the Wonder Trade (the good is good and the bad is REALLY FUCKING BAD).