Its from a different release.
2010 German coundown calendar list:
Delibird - HGSS 39/123
Mareep - HGSS 73/123
Pikachu - HGSS 78/123
Lanturn - Unleashed 48/95
Paras - HGSS 76/123
Miltank - HGSS 47/123
Clefairy - HGSS 60/123
Hoothoot - HGSS 66/123
Meowth - HGSS 75/123
Aipom - Unleashed 43/95
Larvitar - Unleashed 51/95
Onix - Unleashed 56/95
Riolu - Unleashed 60/95
Growlithe - HGSS 63/123
Koffing - HGSS 70/123
Natu - Unleashed 55/95
Horsea - Unleashed 49/95
Chikorita - HGSS 59/123
Cyndaquil - HGSS 61/123
Totodile - HGSS 86/123
Staryu - HGSS 84/123
Marill - HGSS 74/123
Magikarp - HGSS 72/123
Corsola - HGSS 37/123