[MCBarrett]

I liked the idea of this thread and its been dead for a while so i thought i'd start it back up.
Hope my advice helps...

BlankZero

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Turn 5: This is your first mistake really since you weren't aware of nidoking's set and its a pretty uncommon poke in ou. but u-turning into forretress broke your sturdy and allowed him to ko next turn with fire blast. i think u-turning into keldeo would have been the best option. He resisted all of nidoking's moves besides earth power, and threatened him out immediately with a stab water attack.

Turn 7: Here you should have switched into celebi. celebi resists both of rotom-w's stab options and since you have u-turn you can gain back the switch initiative next turn.

Turn 12: The match was pretty much lost at this point already but i think switching out into haxorus would have given you a chance to set up with volcarona after arcanine was gone.

Summary: Not saving your forretress to spin away t-spikes was really detrimental because nearly everything left on your team was hurt by them. You also did not match up very well with arcanine after your keldeo fainted so you should have tried to save your keldeo to have a chance to take out arcanine.

BlackRussian

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Turn 4: Here you should have gone into jirachi immediately rather than heracross and switching into swampert. Jirachi has the best defensive matchup with alakazam and alakazam is most dangerous with a focus sash so breaking that without losing to much should have been your first priority. Also it didn't seem like there were many setup opportunities for jirachi looking at the opponents team.

Turn 13: Here i would have sacked swampert, seeing as it already did the only job it could perform in taking out donphan. Heracross was still around as a physical attacker to take out chansey. After sacking swampert, you then had a perfect opportunity to revenge kill alakazam who is your biggest threat at this point in the match.

Turn 23: First of all you should be running psyshock on cm jirachi as it deals physical damage allowing it to set up more easily on special walls such as chansey. However, you still could have taken out the chansey since at +6 flash cannon would have done 34% each turn and you have a 10% chance at dropping chansey's special defense every turn with flash cannon so you should have stayed in to collect your own wish. If you really wanted to switch though heracross was a better option than swampert since he could survive a seismic toss and regain hp the next turn from the wish.

Turn 24: Should have just gone into heracross here. Poisoning chansey does nothing due to its ability natural cure which heals status such as toxic, burn, paralysis etc. upon switching out.

Summary: Be careful when facing alakazam, break its sash with a poke you know can take an attack such as jirachi or heatran and proceed to revenge kill it. Also psyshock on jirachi would have helped this battle since you did have some set up opportunities.

White Symphoni

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I don't see any real screw ups here. That crit on politoed didn't help. The only thing i can think of is after scizor was taken out you could have brought breloom in to take out mew with mach punch. considering the life orb we can assume its only defensive investment was 4 hp ev which would give mach punch a 99% chance of taking mew out from that range. All that would do is prevent hydreigon from coming in next turn and setting up tailwind. which really didn't bother you considering you had super effective priority on his remaining team besides keldeo. I would honestly have to say you played it the best way you could have. Although it was close as far as number of team members go he had no chance of winning after you started out the match very strongly.