RENAMON, Rika's Digimon
I watched Digimon Tamers on a German TV channel (RTL2) and Renamon was made into a MALE there. I'm used to her being a he but I try to refer to Renamon as a she, since I think it was a bad move turning such a strong female character into a male for no logical reason (especially since they both digivolve to Sakuyamon who is then suddenly female). All this aside, Renamon is Rika's fox-like Digimon partner on a Rookie level who found Rika because she wanted to be partnered with the strongest Tamer there is. Like Rika she appears cold and wants to get stronger but she is more mature.
Digivolution
REREMON
Level: Baby
Attacks: Bubbles, Metamorphosis
First Appearance: /
About: Only in card game.
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VIXIMON/POKOMON
Level: In-Training
Attacks: Killing Stone
First Appearance: Digimon Tamers, Episode 51 (Such Sweet Sorrow)
About: Tamers and their Digimon defeat the D-Reaper and suddenly the Digimon are 'de-digivolving' to their In-Training form. Renamon turns to Viximon.
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RENAMON
Level: Rookie
Attacks: Diamond storm, Rapid Kick, Power Paw, Flaying Kick
First Appearance: Digimon Tamers, Episode 01 (Guilmon Comes Alive)
About: Rika's Digimon partner who is trying to please Rika and get stronger to digivolve in the beginning. Later she becomes Rika's friend not just killing machine.
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KYUUBIMON
Level: Champion
Attacks: Dragon Wheel, Fox Tail Inferno
First Appearance: Digimon Tamers, Episode 6 (O Partner, Where Art Thou?)
About: Rika thinks Renamon can survive without her help and she leaves her Digimon. But in the end of the episode Renamon is in danger and Rika saves her from evil Harppymon. To stop Harppymon from hurting Rika, Renamon digivolves to Kyuubimon.
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TAOMON
Level: Ultimate
Attacks: Talisman of Light, Talisman Star, Talisman Spell
First Appearance: Digimon Tamers, Episode 18 (Digital Beauty)
About: Devas are attacking the real world and Kyuubimon finally digivolves to Taomon. In the end of the episode Rika tells Taomon that she looks beautiful in the moonlight.
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SAKUYAMON
Level: Mega
Attacks: Dragon Helix, Spirit Crusher, Talisman Sphere, Twin Blades of Beauty, Amethyst Wind, Crystal Sphere, Scepter Dash
First Appearance: Digimon Tamers, Episode 39 (Song of Sakuyomon )
About: Matrix Evolution of Rika and Renamon. D-Reaper's bubbles are treating to destroy the DigiWorld. Cyberdramon stops the bubbles for some time but Rika knows they will evetually be free and destroy the DigiWorld. She throws herself in the bubbles and Renamon follows her. Together they digivolve to Sakuyamon.
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Thanks to Happy Galgomon Gif Factory for the Digimon gifs and thanks to Megchan's Digimon Encyclopedia and Digidex for information.