>>328396384 Atk Life Orb Protean Greninja Gunk Shot vs. 252 HP / 4 Def Tangrowth: 265-315 (65.5 - 77.9%) -- guaranteed 2HKO
252 SpA Choice Specs Protean Greninja Ice Beam vs. 252 HP / 252+ SpD Assault Vest Tangrowth: 270-320 (66.8 - 79.2%) -- guaranteed 2HKO
252 SpA Choice Specs Greninja-Ash Ice Beam vs. 252 HP / 252+ SpD Assault Vest Tangrowth: 240-284 (59.4 - 70.2%) -- guaranteed 2HKO
252 SpA Greninja-Ash Ice Beam vs. 252 HP / 252+ SpD Assault Vest Tangrowth: 160-190 (39.6 - 47%) -- guaranteed 3HKO
>>32839637252 SpA Life Orb Protean Greninja Hidden Power Fire vs. 248 HP / 8 SpD Assault Vest Magearna: 133-156 (36.6 - 42.9%) -- guaranteed 3HKO
252 SpA Choice Specs Protean Greninja Hidden Power Fire vs. 248 HP / 8 SpD Assault Vest Magearna: 150-176 (41.3 - 48.4%) -- guaranteed 3HKO
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 248 HP / 8 SpD Assault Vest Magearna: 178-211 (49 - 58.1%) -- 97.7% chance to 2HKO
252 SpA Greninja-Ash Hydro Pump vs. 248 HP / 8 SpD Assault Vest Magearna: 120-142 (33 - 39.1%) -- 99.8% chance to 3HKO
all in all probably safer for magearna but in some cases its ok for tangrowth to come in. take these with a grain of salt