When someone asked how they knew it was the exact same gorilla, the Trainer said: “When you get a Pokemon from a trade, it says “Take good care of (Pokemon Name/Nickname)!” But when you recieve a Pokemon that you’ve previously traded before,like when you do a trade back to evolve Pokemon, it will say “Welcome back (Pokemon Name/Nickname)!” source: dextero.com
So, the message will say welcome back Zarude.
Hope it helps!