>>53869955Body Press is actually weaker than Close Combat (assuming only Atk investment)
252 Atk Choice Band Zamazenta Close Combat vs. 248 HP / 0 Def Abomasnow in Snow: 470-554 (122.7 - 144.6%) -- guaranteed OHKO
+1 4 Def Choice Band Zamazenta Body Press vs. 248 HP / 0 Def Abomasnow in Snow: 372-438 (97.1 - 114.3%) -- 81.3% chance to OHKO
252 Atk Zamazenta-Crowned Close Combat vs. 248 HP / 0 Def Abomasnow in Snow: 314-372 (81.9 - 97.1%) -- guaranteed 2HKO
+1 4 Def Zamazenta-Crowned Body Press vs. 248 HP / 0 Def Abomasnow in Snow: 294-348 (76.7 - 90.8%) -- guaranteed 2HKO
And Body Press sets on an offensive Pokemon are usually shit. It’s either weak as shit because you don’t invest into Def, your coverage is weak as shit because you took Atk investment and put it into Def, or you’re a mono attacker using Iron Defense so you’re hard walled by Ghosts and Unaware users, and walled by many Fighting resists.
Additionally, OU can handle Iron Valiant, and all Zama would provide in practice is unboosted Speed and bulk. Otherwise Iron Valiant kind of outclasses Zama. Also without Pursuit support, both forms might be fine in OU. Zama-C can actually get away with Iron Defense + Body Press because Ghost can be easily Pursuit Trapped.