Each of the twenty drawings shows two things, a Pokémon and something else. That second thing is “kind of” like the Pokémon, in that they are almost anagrams, but you have to change one letter. For example, in the first drawing, you need to change the O from ANCHOR into an E to get an anagram of the Pokémon ARCHEN.
The drawings are shown in alphabetical order of the not-Pokémon part.
The twenty objects’ altered letters span the alphabet from A to T. Sort the Pokémon in that order.
In that sorted order, the twenty Pokémons’ altered letters spell a message. Colin and Violet have different drawing styles, and each new word in the message begins with one of Colin’s drawings.
That message is ON TV THIS WOMAN HEALS US, cluing the final answer NURSE JOY.