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Generation 5 was the best generation in terms of game mechanics.
Fast battles
Silky smooth, stylish menus
Reusable TMs
Not as much power creep as Gen 6 (though it does have a little compared to Gen 4
No megas
It's such a shame that Unova is a shit-tier region. In terms of challenge, region, music, exploration, post-game (PWT is cool but muh frontier, Gen 4 battle factory was THE shit), and all other stuff Platinum was better.
It sucks we didn't get a remake in Gen 5 since it has the best mechanics. Platinum on a Gen 5 engine would be ideal. But as it stands, the objectively best Pokemon games are the ROMhacks Blaze Black 2/Volt White 2