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>Steps to improve Serena --
-- Step 01 : Make her a very strong Battler.
-- Step 02 : Make her more mature , confident and playful.
-- Step 03 : Let her develop fun dynamic with all the characters
-- Step 04 : Stop trying to write a mature teenage romantic subplot between her & Ash since they are kids, not teenagers.
-- Step 05 : Make sure she has curvy figure and confirmed to be G or H cup in the future.
Pokémon 2018 has really improved Serena personality, she just need to develop fun interaction with all the characters including Ash. I think OLM should use Lacey as an example for Serena's interaction with others