Question

Can you use poffins on Pokemon that have already had the maximum amount of pokeblocks used on them?

Comments

Probably

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I'll test this when I'm bothered to.

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Can't remember..

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poffins arent in ruby and sapphire

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if you trabsfer a Pokemon that have already had the maximum amount of pokeblocks used on them to Platinum, you can (or cant :P) feed them Puffins.

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right..

Answer 1

The main factor that indicates whether or not a Pokemon can eat more Pokeblocks/Poffins is Sheen, or fullness. You can indicate the "Sheen" of a Pokemon by looking at how many stars are encircling it on the contest stats screen in R/S/E, or the "Sheen" bar in the Summary Screen of D/P/Pt.

So bottom line:

You can't feed Poffins to a Pokemon who has had the maximum Pokeblocks

Hope I helped!

Sources:
Poffins
Pokeblocks

Edit
Contest Stats and Sheen DO transfer over when you transfer them.

Source