Digital Monster Ver. 1 ( デジタルモンスターＶｅｒ．１ Dejitaru Monsutaa Ver. 1 )is the first series of the Digital Monster virtual pet.

Evolutions

Baby I

Tyranomon:
- Agumon: 4+ calls, Train 5-15, Overfeed 3+, 0-4 Sleep Disturbances.

Meramon:
- Agumon: 4+ Calls, Train 16+, Overfeed 3+, 0-6 Sleep Disturbances.
- Betamon: 0-3 Calls, Train 0-47.

Airdramon:
- Betamon: 4+ Calls, Train 8-31, Overfeed 0-3, 9+ Sleep Disturbances.

Seadramon:
- Betamon: 4+ Calls, Train 8-31, Overfeed 4+, 0-8 Sleep Disturbance.

Numemon:
- Agumon/Betamon: When you do not fulfill the requirements of other Digimon.

Metal Greymon Virus:
- Greymon/Devimon/Airdramon: Fight 15+ battles with a victory ratio 80% or more. (unconfirmed)

Mamemon:
- Tyranomon/Meramon/Seadramon: Fight 15+ battles with a victory ratio 80% or more. (unconfirmed)

Monzaemon:
- Numemon: Fight 15+ battles with a victory ratio 80% or more. (unconfirmed)

General
- The counters are reset when the Digimon evolves. So, for example, nothing that happens to the newly hatched Digimon affects growth at all.
- The requirements for Perfect Digimon are unknown at this time. Some battles are necessary.

Calls/Care Mistakes
- When its hunger hearts run out, the call icon lights up. If you don't feed it for 20 minutes, it goes out again, and that's a care mistake. The same for strength. However, if BOTH hunger and strength run out, it's still only one care mistake. And if you leave it for a few hours before feeding it, and it bleeps again a few times, then even then it's only one care mistake.
- Lights calls are straightforward - leaving the lights on for 20 minutes after it falls asleep is a care mistake.
- Accumulating up to 4 piles of poop has no effect at all. (Larger quantities are unknown.)

Training
- A training session is counted whether or not you complete all 5 rounds. It's counted if you win, if you lose, or even if you cancel in the middle. (Where there's an upper limit on the training requirement, be careful of this.)

Overfeeding
- To overfeed, stuff the Digimon with food until it won't eat any more. It is necessary to wait until it loses a hunger heart before overfeeding it again.

Sleep Disturbances
- Wake the Digimon up by going into the Food menu, training it, or selecting the Battle option.
- If you want to wake it, without this being counted as a wakeup, then set the clock to some time during the day. The Digimon will wake up, with no effect on the counters.