Bellyzard is imo pretty hard to play because of the support it needs. Paralysis is your friend, getting Raikous or Zapdos' down is crucial. You basically need to weaken everything that doesn't get ohkoed by a max attack eq or rs or a fire blast. Blissey needs to be at ~85%, cloyster at ~78%, heracross at 78%, machamp at 72%, Marowak at ~69%, Snorlax at 60%, Starmie at 80%, Suicune at 54%, Umbreon at 57%, Vaporeon at 70%. Those are all the "relevant" things that do not get ohkoed when you are at 999 attack (don't quote me at the calcs, always check them yourself, it's also the minimum rolls btw). Charizard is the fastest drum user, the only things that outspeed it are Raikou, Starmie, Gengar, Jolteon, Alakazam, Espeon and the rarer seen Aerodactyl, Jumpluff and Tauros. Zard ties with Zapdos, Tentacruel, Miltank, Typhlosion, Entei and other Zards obviously. Basically get para on these things or get them out of the way completely, then you "only" need a free turn of setup and you can sweep with zard. Those free turns of setup can be created by inflicting status and just channeling your luck or with Screens support. Meganium does do that quite well, even though you might also go with more conventional screens setters like blissey, raikou, etc. Ususally nobody will instantly switch out of zard because they are afraid of the drum, so they will probably just attack it with what they have and hope for the best. You can also always force something to rest and just hope for your luck with sleep talk rolls to get a free setup. The setup is quite complicated. If you want to go for the zard sweep you gotta make sure to take out the listed things. Cloyster pairs pretty well with it since it can explode on raikou, starme, zapdos. and it actually 3hkoes gengar, which usually has no room for a recovery move. All of those are pretty likely to come in on it. The others that outspeed are not as common in OU, but paralysis is a great backup plan here. Miltank is usually pretty hard to break, you can lure it with drumlax, lovely kiss lax, selfdestruct lax, etc. Curselax is in fact NOT obvious. I know curse is the best set, but depending on your team you can always tailor it to whatever you want it to do, and getting rid of miltank is really handy. Spikes are useful, especially since the residual damage will help you getting things that aren't ohkoed into safe ohko range, again cloyster pairs pretty well here. Generally i am not a big fan of agili passing jolteon. It's just so obvious that it's going to pass, everyone who played gsc once will know what is going to happen, and it doesn't even matter if it's passing growth, a sub or agility. Raikou also makes its life hard. Spreading paralysis is generally more useful and convenient. Since you are dedicating your strategy to a bellydrum sweep you might as well use up a couple of moveslots to support that exactly. Exeggutor likes to spread status generally, Snorlax can spam body slam, your electric can always fish for thunder(bolt) paras, you get the point. I'm gonna let you be a little bit creative when building your team there, because when i just post a team on here it is very likely to end up being bad because i didn't test it, maybe someone has a zard team spare for you on here. When you say this is for in-cart you still mean competitive in the form of gsc ou, right? Because when it's an in game team i wouldn't bother with any of the above stated.