why is adaptability > download?
naturally, sending out porygon randomly should grant you the useful special x1.5 about 50% the time, but in addition to switching him out intelligently (to pokemon you know have superior defense) and the intelligate guesses on pokemon who have equal df/spdf ration (that you would predict have it padded one way or another for its natural benefit in competitive play...)..that "50%" flip is alot more like 75% in your favor if you use it right.
Example: Your last poke gets killed by Rhyperior
you send out PoryZ..BAM. Special-Freakin-Up
they fear icebeam and switch out to water
BAM 1hko t-bolt
Or, earlier in the match they had a ghost poke active. Later on, you send out poryZ and get special-Up. Obviously they're gonna switch to ghost to resist Tri-Attack..but u u remember their ghost and bam, shadowball 1hko, no?
and whats better in the best-case scenarios is that porygon remains uber-powerful no matter what element you utilizes. How can you NOT go wrong w/ this, assuming their blissey is dead?
Is it not worth the risk?
Adapt: TriAttack = 2.25, beams = 1.00
download: TriAttack = 1.5 + special x 1.5 = stronger than STAB at 2.25
...........-PLUS- ice/bolt/shadowball = 1.5(!)
therefore in long run, download gives you more benefit, since it can power up your ice/bolt to make Z even more dangerous, since it can now crush predicted switches from the oponent, whereas they may switch to a Rock, Steel, of Ghost to defend against TriAttack...and get rediculously punished for it.
i have a modest, download porygon level 70 right now...and it kinna worries me everyone is hard for adaptability, but in the heat of battle, where you can make predictions it seems like download could be more useful.
my pool set atm is TriAttack, Recover, IceBeam, SignalBeam(prolly gonna drop to t-wave/shadowball, since that makes poryZ more useful versus a switch to a pokes that would normally beat it one on one, if you can predict the switch, punish, then switch yourself)