Bulding a team based on DD Mega Tyranitar, needs all kinds of suggestions

I always like the idea of dd mega tyranitar because no one expects it, especially when your team has another potential mega evolution. Its amazing bulk and sand storm enable it to easily pull off a late game sweep.

However, I am trapped in my own perspective and can't get out of it. The teams I built are either super weak to common fighting types like keldeo, or have no effective way to deal with scarf/defensive landurous.

I plan to use this team in a local tournament without any Smogon bans, so aegislash, m-mawile and greninja should also be considered