The reason I would stick with Heavy Bone is because most Pokemon don't need 100 hp damage or more to be knocked out especially if they are Stage 1 or Basic Pokemon, I would rather hit 40 hp 3 times in a row then waste 3 turns on Bone Rush, but that is just me, I guess if you are facing a really strong Pokemon in regards to Hp I would probably use Bone Rush to try and put a big dent in your opponent's active Pokemon
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Even if this is the case, you'll need two more turns to get your abilities online
Pair with Hero's Cape and you're at 400HP, have three Munkidori on the bench and a second Blissey ex and you can attach one dark energy, use the first Munki, use Blissey ex to move the energy to the next Munki, and the second Blissey to chain to the third Munki
I came away having only spent around 100, filling dozens of gaps in my binders and grabbing a couple of chase cards to boot