Is Shadow in Sonic the Hedgehog 2

No. Shadow has appeared in:

• Sonic Adventure 2/2 Battle (Dreamcast and Gamecube.)
• Sonic Battle (GBA)
• Sonic Heroes (Xbox, PS2, Gamecube, PC)
• Shadow the Hedgehog (Xbox, PS2, Gamecube)
• Sonic Riders (Xbox, PS2, Gamecube, PC)
• Sonic Riders: Zero Gravity (PS2, Wii)
• Sonic Free Riders (Xbox 360 Kinect)
• Sonic Chronicles: The Dark Brotherhood (DS)
• Sonic and the Black Knight (Wii)
• Sonic and the Secret Rings (Wii)
• Mario and Sonic at the Olympic Games (Wii, DS)
• Mario and Sonic at the Winter Olympic Games (Wii, DS)
• Sonic Rivals (PSP)
• Sonic Rivals 2 (PSP)
• Sonic the Hedgehog (Xbox 360, PS3)
• Sonic Colors (DS version only)
• SEGA Superstars (PS2)
• SEGA Superstars Tennis (PS2, PS3, Xbox 360, Wii, DS)
• SEGA All-Star Racing (PS3, Xbox 360, Wii, DS)

Shadow also appears in Super Smash Bros. Brawl (Wii) as an assist trophy for Sonic.