<p>Porygon2's Trace makes it a unique Pokemon. With its sturdy defenses, good SpAtk, and access to a wide variety of moves, P2 fills some niches that gives it uses over its evolved form. With Trace, Porygon2 can come in on Pokemon with Intimidate and threaten them immediately. Gyarados fears Thunderbolt or Discharge, while Physical variances of Salamence like DDmence and CBmence fear Ice Beam. While P2 can't do almost nothing back, it can come in on Choice'd Heatran quite well, Tracing Flash Fire and absorbing its powerful Flamethrowers/Fire Blasts/Overheats. The two main Eeveelutions have trouble, as Jolteon and Vaporeon find their STAB attacks only help P2 as it Traces Volt Absorb and Water Absorb. It also has the hilarity to lock Magnezone in by Tracing Magnet Pull, as well as locking Dugtrio in by copying its Arena Trap, though P2 can't do much against the former. </p>

<p>Recover is self explanatory, prolonging P2's life span and assisting in its tanking capabilities. Ice Beam is to take care of Salamence, as well as others. The next two moves are based on needs. Thunderbolt has the power factor over Discharge, while Discharge has its 30% chance to paralyze. Thunder Wave is standard, crippling fast sweepers in their tracks. Toxic allows Porygon2 to beat other walls one on one. Magic Coat gets a special mention here, as it allows you to bounce back any harmful effects back to your opponent, like sleep, poison, burn, paralysis, Leech Seed, and others. </p>

<p>If you opt for Thunder Wave or Toxic as your fourth move, use Thunderbolt. If you choose Magic Coat, use Discharge. </p>