No, you cannot make a worse defensive poke without making it an ice- or fire-type. Rock is not the worst defensive typing though (see t-tar), especially if backed by bulk.
It has a SR weakness and resistance to a whopping... two types (normal and poison, which are clearly the best attacking types in the game).
Bug/rock is a really shitty typing and the main reason that armaldo sucked.
Bug ground though? far better due to a SR neutrality, 100% acc stab, and actual resistances. such a pity :(
Bug/Rock is absolutely fine. The two types cancel each others weaknesses out greatly, and 3 2x weaknesses is extremely common. It's resistances suck, but you just have to deal. On the offensive side, Bug/ Rock not only gets neutral coverage with Ground, but hits a lot of things for SE damage. People need to quit acting as if its the worst typing ever.
And Armaldo sucked because it was slow and Scizor got Bullet Punch.
Anyway, I've been itching to get using this thing again, but with all those Scizors running around, it won't have its chance to shine. The great thing is that its abilities work excellently in tadem with Shell Smash. Sturdy/ Salac is a good combo, but Broken Armor could really be the best option.
Could someone tell me how this works, because if it works the way I think it does it would be amazing: White Herb/ Broken Armor.
You bring in your Iwap' and proceed to Shell Smash, opponent attacks (because Iwap is clearly not forcing anything out), activates Broken Armor, White Herb restores stat drops at end of turn, Iwaparesu has +2/ +2/ +3 without any drawbacks.
EDIT:
Hey guys? If you did Shell Break, got hit by a move and survived with Sturdy, and then ate a Salac berry, what kind of speed would we be looking at? Would it be able to outspeed things or.... not a chance?
If you get a SS in and then Salac activates you're looking at 621 Max+ Spe, I think.