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

I have both this card and [ST2-12]/[Matt Ishida] in play. How do I activate their effects?
You can resolve their effects in any order. For example, if you're starting the turn at 1 memory, you can resolve this card's effect first to go up to 3 memory, then activate [ST2-12]/[Matt Ishida]'s effect to go to 4 memory and above.
Ruled Mar 28, 2024
What timing does <Main Timing> occur at?
Like Main effects on Option cards, you can activate these effects at any time during your main phase. However, you can't activate them to interrupt an attack or another effect.
Ruled Mar 28, 2024
Can I use this card's Main effect if I have a level 5 or higher green Digimon in my Breeding Area?
No, Digimon in breeding areas aren't checked by this effect.
Ruled Mar 28, 2024
Does this card's Start of Your Turn effect activate if it is suspended?
Yes, it does. Unless otherwise specified, cards don't lose their effects when suspended.
Ruled Mar 28, 2024
During my breeding phase, I hatch a level 2 Digimon from my Digi-Egg deck. I then digivolve that Digimon into a level 3 Digimon during my main phase. If I use this card's effect to move that Digimon to my battle area, can I attack with it immediately?
Yes, you can. Hatching Digimon and moving them to the battle area doesn't count as playing them, so you can attack with them immediately.
Ruled Mar 28, 2024
Is it possible to suspend this tamer with its <Main Timing> effect and not use its effect?
While it is possible, this can only be done if you have a Level 2 Digimon in your Breeding Area. If you have a Digimon that can be moved out from the Breeding Area it must be moved out. If you have no Digimon in your Breeding Area and cards in your Digi-Egg deck, you must hatch.
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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.