How many of the Pokemon in gen 4 are part of evolution trees from older generations?

Question

So how many Pokemon in sinnoh were evolutions to old Pokemon or prevolutions to older Pokemon? I know it's more than in any other gen but I'd like the exact amount.

Comments

Including names?

Answer 1

Evolutions: 22

Roserade
Ambipom
Mismagius
Honchkrow
Weavile
Magnezone
Lickilicky
Rhyperior
Tangrowth
Electivire
Magmortar
Togekiss
Yanmega
Leafeon
Glaceon
Gliscor
Mamoswine
Porygon-Z
Gallade
Probopass
Dusknoir
Froslass

Pre-evolutions: 7

Budew
Chingling
Bonsly
Mime Jr.
Happiny
Munchlax
Mantyke

Source

Hope I helped!

Answer 2

• Magnemite family (Magnezone)
• Lickitung family (Lickilicky)
• Rhyhorn family (Rhyperior)
• Tangela family (Tangrowth)
• Electabuzz family (Electivire)
• Magmar family (Magmortar)
• Eevee family (Glaceon, Leafeon)
• Chansey family (Happiny)
• Porygon family (Porygon-Z)
• Snorlax family (Munchlax)
• Togepi family (Togekiss)
• Sudowoodo family (Bonsly)
• Aipom family (Ambipom)
• Yanma family (Yanmega)
• Murkrow family (Honchkrow)
• Misdreavus family (Mismagius)
• Gligar family (Gliscor)
• Sneasel family (Weavile)
• Swinub family (Mamoswine)
• Mantine family (Mantyke)
• Ralts family (Gallade)
• Nosepass family (Probopass)
• Roselia family (Roserade, Budew)
• Snorunt family (Frosslass)
• Chimecho family (Chimecho)
• Mr. Mime family (Mime Jr.)

Generation IV introduced the most evolutionary relatives to Pokémon from previous generations, with 29.

Source
Hope this helps. 29 in all, including pre-evolutions.