Pokemon Go players had a weird experience: wild Pokemon you caught mutate keeping the value of CP. For example, a player captured a wild Weedle but it transforms into a Pidgey.
There is no way to avoid the problem at this point with except of waiting for Niantic's announce.
It is observed that other wild Pokemon transform into a different one. Here are the reports.
The Magicarp transformed into Slowbro with keeping the CP value. On the journal, it is recorded as Slowbro was caught.
