Python: Avoid overwriting dictionary keys in a for loop

Python 3.11

I'm not sure if I'm needing to individually create the dictionaries and merge them together? But using the for loop, I'm not able to figure out how to avoid overwriting the first key. I'm wanting to append an additional key:value pair.

pokelist = ['rattata', 'meowth', 'eevee']

def get_pokemon_by_type(pokemon_list):
    pokedex = {}
    for pokemon_name in pokemon_list:
        url       = f'https://pokeapi.co/api/v2/pokemon/{pokemon_name}'
        response  = requests.get(url)
        weight    = response.json()['weight']
        abilities = []
        for ability in response.json()['abilities']:
            abilities.append(ability['ability']['name'].title())
        for t in response.json()['types']:
            pokedex |= {t['type']['name']: {pokemon_name: {'Abilities': abilities, 'Weight' : weight}}}
    return pokedex
            
get_pokemon_by_type(pokelist)

Current output:

{'normal': {
'eevee':   {'Abilities': ['Run-Away', 'Adaptability', 'Anticipation'], 'Weight': 65}
}
}

Expected output:

{'normal': {
'rattata': {'Abilities': ['Run-Away', 'Guts', 'Hustle'],'Weight': 35},
'meowth':  {'Abilities': ['Pickup', 'Technician', 'Unnerve'],'Weight': 42},
'eevee':   {'Abilities': ['Run-Away', 'Adaptability', 'Anticipation'],'Weight': 65}
}
}

You don't want to union the new dict with pokedex; you want to map the name of the current Pokemon to the new dict.

pokedex.setdefault(t['type']['name'], {})[pokemon_name] = {'Abilities': abilities, 'Weight' : weight}}

In your current code, you replace one dict mapped to the name normal with a completely new dict that also has the key normal, rather than updating the existing normal dict.