(For Whatever Form)
Landorus @ Bright Powder/Wide Lens
Moveset:
- Bulldoze
- Rock Tomb
- Grass Knot
- Focus Blast
As you can see already, this moveset encourages slowing down opposing Pokemon. I encourage a stat of 252 SAtk, 252 Atk, and 4 Spe with a Relaxed, Lax, or Sassy nature which prioritizes defenses over speed or other defenses.
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Bulldoze - Bulldoze covers various Pokemon while still lowering their speed a stage. It also gets STAB which changes the power from 60 to 90 which is still okay since you're lowering speed. With the natures provided, it seems easy to come back the next round since none of those decrease speed. If you're training with the stats I've provided, however, you might want to plan anywhere from 2-3 rounds** with Bulldoze in play.
Rock Tomb - Rock Tomb provides coverage and lowers speed as well. Rock Tomb is here for the coverage and for the opposing flying types that cause trouble cough Articuno cough and with the Wide Lens in play, it makes it harder to miss this attack on them.
Grass Knot - Grass Knot is primarily coverage for water types. There's not much of anything else to say after that.
Focus Blast - Focus Blast adds coverage and gives potential chance to kill the opposing Pokemon's special defense. With its accuracy, however, you may miss which is why I recommend Wide Lens on the Pokemon.
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Bright Powder Usage - If you think that enemies are prone to attack, don't like the day-to-day enemies that attack Landorus, or know you have amazing luck, you may try out using Bright Powder and lower the opponent's accuracy instead. With this moveset, however, you may just try using Hammer Arm or Brick Break instead of Focus Blast if you want to balance things out. Rock Tomb** shouldn't be that much of a problem.