Still working on that picture of my X Version team... (I wish I wasn't so lazy...)
Squritle has a Bold nature, so he prefers Citrus-flavored PokePuffs. Espurr, on the other hand, has a Calm nature, so her favorite PokePuff flavor is Mocha. Yeah, I am comparing PokePuffs to Pokeblocks and Poffin.
Spiced = Spicy - this is obvious
Mint = Dry - because the Mint Berry wakes Pokemon up, as does the Dry-flavored Chesto Berry
Sweet = Sweet - again, obvious
Mocha = Bitter - Mocha is related to coffee, which is Bitter by default
Citrus = Sour - Citrus fruits tend to have a tangy flavor of both Sweet and Sour