Wanting a shiny Shellder with Rock Blast and near-perfect IVs.
Worse comes to worse I'll go for the Rock Blast and perfect IVs.

I can offer;
Deino w/ Dark Pulse
Ferroseed w/ Spikes & Leech Seed
DW Chimecho
Adamant Beldum
UT Zorua

Shiny Shellder;
Shiny Tyranitar 252 att/156hp/100spd
Shiny Rapidash 252att/252spd
Shiny Audino 252hp/252Sdef/4def
Shiny Seviper - UT