After I activate this card's ＜Main Timing＞ effect and place [Growlmon] and [WarGrowlmon] in my [Guilmon]'s digivolution cards. Can I choose to not digivolve it into [Gallantmon] in my hand?

Yes, you can. In such cases, the cards placed in [Guilmon]'s digivolution cards stay there.

Takato Matsuki rulings (BT12-089)

2 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Effect: [Start of Your Turn] If you have 2 or less memory, set it to 3. [Main] [Once Per Turn] By placing this Tamer and 1 [Growlmon] and 1 [WarGrowlmon] from your Trash in any order as the bottom digivolution cards of one of your [Guilmon], that Digimon may digivolve into [Gallantmon] in your hand for its digivolution cost, ignoring its level. The Digimon digivolved by this effect gets +2000 DP for the turn.
Security effect: [Security] Play this card without paying the cost.

Official Q&A

After I activate this card's ＜Main Timing＞ effect and place [Growlmon] and [WarGrowlmon] in my [Guilmon]'s digivolution cards. Can I choose to not digivolve it into [Gallantmon] in my hand?
Yes, you can. In such cases, the cards placed in [Guilmon]'s digivolution cards stay there.
Ruled Mar 28, 2024
Can I digivolve one of my [Guilmon] to a [Gallantmon] in my hand when an effect to digivolve one of my Digimon other than this card's is activated?
No, you can’t.
Ruled Mar 28, 2024

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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.

Takato Matsuki rulings (BT12-089)

2 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Effect: [Start of Your Turn] If you have 2 or less memory, set it to 3. [Main] [Once Per Turn] By placing this Tamer and 1 [Growlmon] and 1 [WarGrowlmon] from your Trash in any order as the bottom digivolution cards of one of your [Guilmon], that Digimon may digivolve into [Gallantmon] in your hand for its digivolution cost, ignoring its level. The Digimon digivolved by this effect gets +2000 DP for the turn.
Security effect: [Security] Play this card without paying the cost.

Official Q&A

After I activate this card's ＜Main Timing＞ effect and place [Growlmon] and [WarGrowlmon] in my [Guilmon]'s digivolution cards. Can I choose to not digivolve it into [Gallantmon] in my hand?
Yes, you can. In such cases, the cards placed in [Guilmon]'s digivolution cards stay there.
Ruled Mar 28, 2024
Can I digivolve one of my [Guilmon] to a [Gallantmon] in my hand when an effect to digivolve one of my Digimon other than this card's is activated?
No, you can’t.
Ruled Mar 28, 2024

Got a line that uses Takato Matsuki? Map it in the builder and share it with a link.