A pokemon with simply amazing bst, great movepool, decent typing. But his ability blows more coke than charlie sheen. Lets take a look at this underwhelming slaking broski.
BST
110/160/110/80/110/100
Movepool (Bolded moves are what's up)
--: Fire Punch
--: Ice Punch
--: Thunderpunch
--: Dizzy Punch
--: Knock Off
--: Confuse Ray
--: Foresight
Lv 25: Revenge
Lv 40: Wide Guard
Lv 50: Zen Headbutt
Lv 65: Payback
Lv 75: Crush Grip
Lv 90: Heavy Bomber
Lv 100: Giga Impact
--: Ice Punch
--: Thunderpunch
--: Dizzy Punch
--: Knock Off
--: Confuse Ray
--: Foresight
Lv 25: Revenge
Lv 40: Wide Guard
Lv 50: Zen Headbutt
Lv 65: Payback
Lv 75: Crush Grip
Lv 90: Heavy Bomber
Lv 100: Giga Impact
Toxic
Hidden Power
Sunny Day
Hyper Beam
Rain Dance
Safeguard
Frustration
Knock Down
Thunderbolt
Thunder
Earthquake
Return
Brick Break
Double Team
Rock Tomb
Aerial Ace
Facade
Sing A Round
Focus Blast
Fling
Payback
Vengeance
Giga Impact
Rock Polish
Stone Edge
Thunder Wave
Rock Slide
Swagger
Rock Smash
Strength
Hidden Power
Sunny Day
Hyper Beam
Rain Dance
Safeguard
Frustration
Knock Down
Thunderbolt
Thunder
Earthquake
Return
Brick Break
Double Team
Rock Tomb
Aerial Ace
Facade
Sing A Round
Focus Blast
Fling
Payback
Vengeance
Giga Impact
Rock Polish
Stone Edge
Thunder Wave
Rock Slide
Swagger
Rock Smash
Strength
Everyone knows why he is bad, Slow start halves his attack and speed for 5 turns, which is honestly a pretty long time, but he does have a great natural bulk and the movepool to stall long enough to make himself useful.
Heres the set I've been running in RU to great effect.
Regigigas @ Leftovers
Careful (+Sdef -Satk)
Hp252 Atk4 Sdef252
~ Knock Off
~ Frustration
~Thunder Wave
~ Confuse Ray/Substitute
This guy is my excellent Utility counter to alot of threats in RU, knock-off is a godsend in a teir where usually atleast one (alot of the time more) pokemon are using an eviolite. And Also hurts those pokemon that love their leftovers regeration. With the way his massive bulk is proportioned, he can take a Focus Blast from a Specs Alakazam, So you know he can take a bug buzz from the omni-present Yanmegas then criple them with thunderwave. Not to mention that frustration, even without investment is able to break subs on most people even before your ability wears off. He has an incredibly hard time against sub split ghosts, and steel types. but if your able to check those with team support he becomes a giant monster that the opponent, crippling people left and right. The most important thing to remember is not to get excited about finishing slow start that you misplay. Play him as though he wasnt that strong, but after those five turns he does wreck.
Get out there and have fun.