Charge Thunder Build Miraidon - DecimatedSoul

Guide

Hadron Engine - Passive Ability
Create Electric Terrain around Miraidon for 10s when hitting an enemy player with a Move. If Miraidon has Aeos Energy, up to 40 energy (in multiples of 10) will be consumed when the Electric Terrain is created, increasing the size of the Electric Terrain. Miraidon and allies cannot be put to sleep on Electric Terrain. Miraidon on the Electric Terrain deals 30% additional Move damage while allies will deal 10% additional Move damage. Electric Terrain also strengthens ally team goals' healing and shielding by 30% and weakens enemy team goals' healing and shielding by 30%. This ability goes on a 30s cooldown after it's triggered.

Charge Beam - Ranged (8.5s cd)
Level 5 - Charge power before firing an electric beam in a designated direction. If this move hits an enemy, Miraidon's Sp. Atk is increased by 10% for 6s and stores electric power, stacking twice. If electric power is stored twice within a short time, Charge Beam becomes Boosted. Boosted Charge Beam can be held for up to 10s and continuously fires an electric beam in a designated direction, dealing damage to all enemies in the area of effect and granting Miraidon Hindrance Resistance. Miraidon may move while firing the electric beam but may not change the original direction. A maximum of 2 uses can be kept in reserve. There is a 1s cooldown between uses.
Damage - Regular: 70% SpA + 7 x (Level - 1) + 360
Damage - Boosted (per tick, x15 ticks): 18.9% SpA + 2 x (Level - 1) + 87
Level 11 - Reduces the cooldown to charge by 0.5s.

Thunder - Debuff (10s cd)
Level 7 - Summon a cloud in the skies dropping thunderbolts at set intervals. The summoned cloud moves slowly towards the nearest enemy. Thunderbolts deal damage and apply a 10% slow to enemies hit.
Damage (x5): 18% SpA + 6 x (Level - 1) + 200
Level 13 - Increases the slow effect to 20%.

Bright Future Meteor Strom - Area (112s cd)
Level 9 - Calls down up to 5 meteorites in a row, dealing damage to enemies hit. If a meteorite hits an enemy, the next meteorite to fall will deal 20% increased damage for the duration of this move and stacks. The final meteorite always deals higher damage in a wider area of effect and throws enemies hit for 1s. This move may be cancelled early by releasing the command. Starting the move consumes 10% of Unite charge. For every meteorite dropped, reduce Unite charge by 30%. Miraidon gains Hindrance Resistance while using this move.
Damage - Base per meteorite: 70% SpA + 5 x (Level - 1) + 500
Unite Buffs (6s duration): 30% Movement Speed, 30% CDR, 20% Max HP Shield