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Submitted for your approval.
The Lake Trio belong with the Creation Trio. They are the human response to universal principles.
Mesprit = emotion, how one responds to the world (the "space") around them and fills it with meaning, without it everything is void. (Palkia)
Azelf = willpower, how one's desires and determination shape the passage of history, without it we would allow things to go on without any input. (Dialga)
Uxie = knowledge, allowing us to pierce the unknown, going so far as to understand parallel worlds and alternate states of existence, without it even the familiar is strange. (Giratina)
Evidence their colors match, idk.