Cleffa (N1 20). Ditto (FO 3). Ditto facing a Baby Pokémon should inherit the baby rule and require the opponent to flip before attacking. It currently does not.
Game starting
Game type: QUICKPLAY
Game format: Base–Neo
Player A: Hydra
Player B: JasonKlaczynski
Player A does not have any basic pokemon in his hand!. Redistributing.
Player A does not have any basic pokemon in his hand!. Redistributing.
Player B drew an extra card.
Player B drew an extra card.
Player B drew an extra card.
Player B drew an extra card.
Coin flip result: HEADS
Player A will start.
Game setup complete
Between turns
Turn 1 begins
Player A drew 1 card
Player A played Fossil Egg.
Coin flip result: HEADS
Aerodactyl was put on bench
Player A played Computer Search.
A has shuffled deck.
Put Cleffa onto bench
Attached a Double Colorless Energy to Aerodactyl.
Player A played Professor Oak.
Player A drew 7 card
Player A played Mysterious Fossil.
Between turns
Turn 2 begins
Player B drew 1 card
Player B played Good Manners.
B has shuffled deck.
Ecogym is now in play.
Focus Band is attached to Cleffa
Put Sneasel onto bench
Attached a Rainbow Energy to Sneasel.
Sneasel got 10 damage
Player B played Professor Elm.
B has shuffled deck.
Player B drew 7 card
Between turns
Turn 3 begins
Player A drew 1 card
Put Tyrogue onto bench
Tyrogue retreated.
Cleffa is now active
Attached a Lightning Energy to Cleffa.
Baby Power coin flip result: HEADS
Cleffa used Eeeeeeek
A has shuffled deck.
Player A drew 7 card
Between turns
Turn 4 begins
Player B drew 1 card
Attached a Darkness Energy to Sneasel.
Cleffa retreated.
Sneasel is now active
Gold Berry is attached to Sneasel
Baby Power coin flip result: TAILS
Baby power ends turn without attacking
Between turns
Turn 5 begins
Player A drew 1 card
Mysterious Fossil was knocked out
Put Rocket’s Zapdos onto bench
Put Ditto onto bench
Cleffa retreated.
Ditto is now active
Attached a Double Colorless Energy to Ditto.
Ditto used Beat Up
Coin flip result: HEADS TAILS TAILS TAILS TAILS TAILS
Ditto did 20 damage to Sneasel
Between turns
Turn 6 begins
Player B drew 1 card
[Hydra]: 
Player B played Lass.
A has shuffled deck.
B has shuffled deck.
Put Magby onto bench
Sneasel retreated.
Cleffa is now active
Attached a Rainbow Energy to Cleffa.
Cleffa got 10 damage
Cleffa used Eeeeeeek
B has shuffled deck.
Player B drew 7 card
Between turns
Turn 7 begins
Player A drew 1 card
[Hydra]: ohh
[Hydra]: not baby effect?
[JasonKlaczynski]: Did it not make me flip?
[Hydra]: yeah
[Hydra]: xd
@developers
This issue doesn’t exist anymore