What it does
Bulk Up raises the user's Attack and Defense one stage each in a single turn. Unlike Swords Dance, which focuses purely on offense, this one also boosts durability — so your setup sweeper doesn't just hit harder, it sticks around long enough to make the boosts matter.
In doubles, your physical attacker faces two opponents at once. A paper-thin setup mon that only raises Attack often gets targeted and knocked out before it can swing once. The Defense raise is what gives you the extra turns to actually use your boosts. One stage of Defense means roughly 1.5× effective physical bulk — opponents need to throw significantly more damage to get the KO.
The Attack raise follows the same math: one stage is 1.5× your base attack, two stages is 2×. After two Bulk Ups on a strong physical attacker, most targets are being one-shot.
Who runs it
Corviknight (39%) is the most natural user. Massive base Defense, Pressure draining opponent PP — stack Bulk Up on top and it becomes nearly impossible to remove without a dedicated counter. It runs Body Press, which calculates damage from Defense, so every Bulk Up simultaneously raises offense and effective offense. Partners that can redirect hits with Follow Me let it set up freely.
Ceruledge (54%) wants one or two Bulk Up boosts and then immediately threatens to run over the board. Flash Fire gives it a free switch-in on fire moves, and Bitter Blade under Bulk Up boosts both heals HP and hits harder — a combination that makes it extremely difficult to pressure out. It can't afford to sit and stack for five turns, but one-to-two boosts into offense is a clean gameplan.
Palafin (8%) runs it differently — its Hero form already has monstrous base Attack, so even one Bulk Up is enough to push its physical moves into KO range on targets that would normally survive. The Defense raise adds just enough extra sturdiness to handle priority moves or chip from support moves.
How to use it
Lead Protect: In doubles, your setup mon almost always needs to Protect on turn one while your partner sets up conditions — speed control, redirection, or hazard removal. Trying to Bulk Up on turn one gets you doubled by two opponents before you have any boosts.
Count how many you need: Against a physical-heavy opponent, two Bulk Up boosts reduce incoming physical damage to roughly 44% of normal. One boost is usually enough to start swinging; two makes you nearly unbreakable from the physical side. Don't chase five-stage setups in doubles — the game doesn't last long enough.
Trick Room timing: Slow users like Corviknight pair perfectly with Trick Room — once the room is up, opponents can't outspeed you to interrupt setup. Set up the room first, then start stacking Bulk Up.
Tips & strategy
Special attacks ignore your Defense. If opponents switch in a special attacker mid-setup, all your Defense investment becomes worthless. Read the opponent's team during team preview — if they have a special attacker that outspeeds you, think twice before investing multiple turns into Bulk Up.
Body Press synergy on Corviknight: Since Body Press deals damage based on Defense, every Bulk Up simultaneously raises both effective Attack and Defense for Body Press calculations. This is the most efficient Bulk Up application on a support-style Pokemon — you don't need to invest in Attack at all.
Redirection support: Follow Me from a partner soaks up the hits aimed at your setup mon. Planned redirection is often more efficient than simply making your Bulk Up user bulkier — it lets you set up behind a safety net instead of betting on surviving raw hits.