A fresh pear with a minor leafy flavor.
In Kanto, pear bites you! Seriously. If you try to eat it it'll bite you. Unless you kill it first, in which case it would just sorta taste like a regular pear.
Blue raspberry Jell-O
Untouched blue raspberry Jell-O that sat under a heat lamp at a Chinese buffet for a few days.
Beefy, but with a distinct friendshippy magic taste.
Beefy, but with a stringier texture. Also after you kill one you can just walk away for an hour or so and return to a perfectly-cooked Rapidash. Talk about convenient!
Slowpoke would taste like pork, though we imagine that the tail would be the most delicious part because...