Yea but like i planted witg my therain landerus sr and than i used defog and the oppenet charizard cane in with no hurt from the sr so it was bad.
I guess i should stick to excadrill or maybe mega blastoise?
What were you using as your Defogger? As other than loosing rocks, was it less effective at it's job than say another Spinner/Defoger could possibly be? Could it handle Aegislash? All questions you need to ask when choosing your Spinner/Defogger, yet it also should try and have good synergy with the rest of your team.
This also might be more something for Competitive SQSA, but a I'll answer anyway as it's relevant to breeding an in-game spinner. Excadrill is slightly less viable in-game without access to its beloved Steel STAB (Iron Head). So the best Excadrill in-game would likely have to be RNG'd on BW BW2 and transfered over, which there are plently of people here who are in the know on how to do that.
On the simulator, your choice is up to personal preference. Mega Blastoise takes up a Mega Slot which you'd need to think about if you were willing to give that up. Offensively, Mega-Blastoise doesn't outdamage 'Drill in taking down Aegislash:
252+ Atk Mold Breaker Excadrill Earthquake vs. 252 HP / 0 Def Aegislash-Shield: 260-308 (80.2 - 95%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Mega Launcher Mega Blastoise Dark Pulse vs. 252 HP / 0 SpD Aegislash-Shield: 208-246 (64.1 - 75.9%) -- guaranteed 2HKO after Leftovers recovery
M-Blastoise however, will live one more hit from Aegislash than 'Drill would.
252+ SpA Aegislash-Blade Shadow Ball vs. 252 HP / 4 SpD Mega Blastoise: 142-168 (39.2 - 46.4%) -- guaranteed 3HKO
It can more safely come in to Aegislash without the need off a free switch. Aegislash and M-Blastoise both would be coming down to 2HKOing each other but that last hit, Aegislash could pick of M-Blastoise with Shadow Sneak. So defensively, the two aren't much better than one another for countering Aegislash. Both 2HKO it, get pretty much 2/3HKO or 2HKO + SS and will both outspeed any Aegislash set than isn't a set-up Automatize one. They'll both force the neccesary switches for a spin or pick off Aegislash, but it comes down to a matter of:
1. Which is better suited to your team?
Excadrill is more viable in the OU metagame for its viability outside of spinning. It can pick off Rotom-W, abuse Sand Rush, run a Scarf set (though this is less viable if 'Drill's intended job is to spin), where as M-Blastoise has a more limited job. It spins, and really only has one set in OU. In OU, it usually does just that, where as 'Drill can fufill multiple roles and your opponent must think as to what your 'Drill's set really is.
Blastoise, it's an easy guess.
2. Would you give up your Mega Slot for Mega Blastoise?
Pretty self-explanatory.