Timid hinders Tyranitar's high Attack, considering that you're using two physical moves on it. Change it to Mild or Hasty.
Honestly, I'd rather have Gastrodon over Empoleon so that you can check opposing Rain teams, which are all over the place:
-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
Mixed Lucario, while interesting, doesn't do as well as mixed Infernape, as it's difficult to string together mixed coverage moves. While I'd suggest Infernape for this, you already have a Fire attacker in Heatran. I feel that Landorus would make a better option because both of its abilities benefit its attacks; also, it gets Swords Dance to make its Sand Force-boosted moves more potent. Terrakion is also viable, as it benefits from the 1.5x Special Defense boost in Sandstorm:
Landorus:
-Swords Dance
-Earthquake
-Stone Edge
-Hidden Power (Ice)/Explosion
Nature: Naive/Jolly
EVs: 252 Atk/4 SAtk/252 Spe
Item: Life Orb
Ability: Sand Force
or
-Earth Power
-Focus Blast
-Hidden Power (Ice)
-Rock Polish/Substitute/Psychic
Nature: Timid/Modest
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Ability: Sheer Force
Terrakion:
-Swords Dance
-Rock Polish
-Close Combat
-Stone Edge
Nature: Jolly/Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Air Balloon/Rock Gem
or
-Close Combat
-Stone Edge
-X-Scissor
-Quick Attack/Sacred Sword/Rock Slide
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Choice Band/Choice Scarf