There's Obviously Azelf, Infernape and Salamence that are OU Destroyers. (barring DD's SD's and choice items)

In UU I've noticed Azumarill, Scyther, Alakazam in OU too.

can you guys suggest any thing for Zapdos that easily 2HKO's (such as SE Machamp) and other walls

P.S feel free to discuss other tiers such as LC and Uber

riolu is IMO the most underrated sweeper in LC, he can survive a gligar EQ and agility sweep given the proper support, he suffer moveslot syndrome though.

in OU, lucario can break most common walls after a SD, mixmence is the OU top destroyer using the mixed set. infernape dont work anymore because of latias.

in UU i like SD and mixed sceptile, SD blaziken and SD/NP monferno(you heard me, MONFERNO)

in ubers mixquaza, mix palkia, mix giratina and mix dialga are IMO the most dangerous ones because its impossible to find a safe switch in for those.

raikou is a beast in ou

I play OU and Rock Polish Gene and Terrak are by far the most devostating due at the moment.