Question

In ORAS which is the strongest move that Kyogre or Groundon has in TM's or HM's or Lv up???

Answer 1

Kyogre's strongest moves:
Water Spout - Base Power 150(via level up at level 90)
Hyper Beam - Base Power 150(via TM)
Giga Impact - Base Power 150(via TM)

[Source][1]

Groudon's strongest moves:
Eruption - Base Power 150(via level up at level 90)
Hyper Beam - Base Power 150(via TM)
Giga Impact - Base Power 150(via TM)

[Source][2]

Edit from Blob
Must note that when stab is taken into account Water Spout hits 225 base power. Groudon does not get this same boost for Eruption given it is a Ground not Fire type. Groudon does however learn Earthquake which after stab hits a 150BP which is a good alternative to Giga Impact as no turn recharge is required after use.

When taking the rain and sun taken into play (summoned by each Pokemon), Eruption and Water Spout are further increased by 50%.
[1]: http://pokemondb.net/pokedex/kyogre
[2]: http://pokemondb.net/pokedex/groudon

Comments

Primal-kyogre+waterspout is the most powerful move in the game

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Actually, it's Specs Kyogre Water Spout in Rain. Close, but no banana.

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Pretty sure it's primal Kroger but what do I know, I'm the king of the hoen region practically

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Water Gem @Astronautical :3

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ur the king of hoen region
but not the king of hoenn region
where kyogre and groudon originated in

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to prove that ur more a peasant
kyogre has 150 max sp atk + rain + choice specs 50% boost
primal has 180 max sp atk + rain(still the same boost)
or if ur lazy enough                                           PWR      Acc
    Origin Pulse    WATER    Special    110    85
    Water Spout    WATER    Special    150    100

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primal groudon has fire type and get stab from eruption