Well. First of all, there are a lot more useful items to use in your Tyranitar. Focus Sash is a waste on such a bulky Pokémon. With that set I would recomend Special Defensive Tyranitar with 252 HP / 252 SDef / 4 Atk with a Sassy Nature and Leftovers or Chople Berry as the held item. That way you have a much more durable weather inducer.
Secondly, you have 3 Pokémon with a weakness to common Fire moves (2 with a x4 weakness) and 4 (!) with a Fighting weakness. I would remove Scizor and replace it for anything resistant to Fire
AND Fighting (Latias, Jellicent- a nice spin blocker - for example), since you already have 2 sweepers (Lucario and Gliscor).
In Cradily's set i would remove Seed Bomb and replace it with Giga Drain which is in most cases the best choice. Change your nature to Bold. Keep in mind that your Cradily s screaming "come and setup in my face" at Steel Types.
Nothing to criticize about Gliscor and Lucario, except that they both play the very same role in your team.
Mixed lead Tyranitar is perfectly viable, as while it doesn't have the best Special Attack, it can use its wide special movepool to surprise its counters, so the OP probably chose its current set for the surprise factor.
I'd say that Gastrodon is the better option over Cradily because of its ability to function against rain teams:
-Earthquake/Earth Power
-Scald/Ice Beam
-Toxic
-Recover
Nature: Sassy/Calm
EVs: 252 HP/84 Def/172 SDef
Item: Leftovers
Ability: Storm Drain
or
-Surf
-Earth Power
-Ice Beam
-Recover/Hidden Power (Grass)
Nature: Modest
EVs: 124 HP/252 SAtk/132 SDef
Item: Life Orb/Choice Specs
Ability: Storm Drain
If you want to keep Cradily, change the ability to Storm Drain, the nature to Bold and the offensive move to Giga Drain.