>>33449999I'd personally go all into Sp.Atk rather than mixed.
The first two moves are STAB - Dragon Pulse and Flash Cannon. As for the other two, there's quite a few options between Aura Sphere, Earth Power, Power Gem, Ice Beam, Thunderbolt, and Flamethrower. Personally, here's my analysis: Dragon/Steel STAB is only resisted by fairy, other steel types, electric, water, and fire. Which means I'd definitely pick Power Gem and Aura Sphere for the most coverage, and most types that can be hit for super-effective damage, which would be as follows: Dragon, Bug, Steel, Rock, Fairy, Ice, Flying, Fire, Normal, and Dark. That's 10/18 types - however, I don't think anything would resist every move this set.
