Misty doesn't have pajama scenes. She's either in bikinis or her default outfit since she doesn't wear socks and we see her barefoot whenever she takes off her shoes.
May's scenes are only swimsuits and the arabian dress with the sandals in the DP episodes. She technically has a pajama scene in DP78 but she's wearing slippers so you only see a bit of her heels and I don't count those.
Dawn's pajama scenes: 1, 9, 61, 88, 154, 174 of DP and 74 of 2019 anime.
Iris's pajama scenes: 49, 68
Serena's pajama scenes: Everything except Movie 17 and ED2
Bonnie's pajama scenes: XYZ 21
Lillie doesn't have any. This privileged white bitch is wearing socks with her pajamas for some reason.
Mallow's pajama scenes: 48, 117 (not exactly pajama, but kimono for nightwear in 117)
Koharu's pajama scenes: 11, 52, 74
I forgot to mention this but the source is Japanese DVDs for the SD episodes and Amazon Japan for the HD episodes. Depending on what torrent/page you use, the numbering may be off by 2 or 3 episodes because of special episodes that some sources include in the main series while others have them separately. Also, the dub version has cut one of Misty's scene and of course you don't get the ones from the Japanese openings/endings.