If a Tamer is also treated as a Digimon using an "is also treated as a Digimon with X000 DP" effect, and later it gains another "is also treated as a Digimon with X000 DP" effect, what happens?
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Official Ruling
If an effect has triggered and the card is affected by a "is also treated as a Digimon with X000 DP" effect, the play cost, level, and DP are overwritten by the newer effect. However, if an effect has already activated and the card is affected by a "is also treated as a Digimon with X000 DP" effect, the already activated effect will be overwritten. Any other effects such as <Rush> that are later gained will be added.
Source: AD1-021 Marcus Damon & Agumon