Ends the 23rd, presumably 1PDT.
The following Pokemon get an evolution in Gen 4, with varying levels of usability: Roselia, Aipom, Misdreavus, Murkrow, Sneasel, Magneton, Lickitung, Rhydon, Tangela, Electabuzz, Magmar, Togetic, Yanma, Eevee (x2), Gligar, Piloswine, Porygon2, Kirlia (male only), Nosepass, Dusclops, Snorunt (female only).
Many of them likely to require an evolution item or potentially know a particular move, making some susceptible to having moves made legacy. Tangela and Piloswine for example are required to know Ancient Power in the main series in order to evolve, but they currently do not receive this in Go.