[App Fusion] [Sociamon] & [Gossipmon]: Cost 0 (If 2 such cards are linked together, stack the link card on top and digivolve.)
<Blocker>
[On Play] [When Digivolving] You may link 1 level 4 or lower Digimon card from your trash or this Digimon's digivolution cards to this Digimon without paying the cost.
[Your Turn] [Once Per Turn] When this Digimon gets linked, give 1 of your opponent's Digimon "[Start of Your Main Phase] This Digimon attacks." until their turn ends.
Inherited Effect
+4000 DP
<Link> [Appmon] trait: Cost 3 (Plug this card from the hand or battle area sideways into the specified Digimon in the battle area.)
[All Turns] [Once Per Turn] When this Digimon would leave the battle area, by trashing 1 of this Digimon's link cards, it doesn't leave.
Rulings Q&A — 4 entries
Q1Q4581
Can I use this card's [On Play] [When Digivolving] effect to link a card that doesn't have <Link>?
If a Digimon's maximum links is increased using <Link +1> and has a total of 2 link cards including this card, then it would be removed from the battle area, can I choose from among those cards to trash for this card's <Link> effect?
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Official Ruling
Yes, you can choose 1 card from among that Digimon's link cards and trash it.