Why do some Pokémon "glow" [duplicate]

In the Overview of your caught Pokémon, some of them have a blue "glow" around them (see the two right-most Hornlius/Weedles and one of the Taubsis/Pidgeys in the following screenshot).

Does this indicate something special? Is this anything good/bad?

Pokemon Overview


The blue glow indicates that the Pokemon was caught within the last 24 hours.