water and probably grass types
flying types weaknesses are rock type and electric type.
Bastidon is both Rock and Steel type. Both Rock and Steel types are weak against Ground and Fighting. Either will have a x4 type advantage over Bastidon.
About any type can damage Steel-types, but its weaknesses are Fire, Ground, and Fighting-types. It's not recommended to fight them with Steel, Grass, Ice, Flying, Rock, Fairy, Psychic, Bug, and Dragon-types, for they are resistant to those types. It is completely immune to Poison-types.
All known Pokemon have a weakness. But there is only one knoen Pokemon that does not have a weakness and that is Spiritomb he is found in both Pearl and Diamond but it is hard to catch. My reccomendation is get it from a trade in Wi-Fi or a friend.
Cranidos is a Rock Type. This means that Water, Grass, Fighting, Ground and Steel type moves are super effective.
flying types weaknesses are rock type and electric type.
Steel has a couple weaknesses. Fire, fighting* and ground are the steels biggest weakness. And then there is the fact that many steel types have a secondary typing such as magneton witch is a dual steel and electric type so ground is 4x effective. *Keep in mind that all steel types have awesome physical defenses so fighting is only technically strong against steel.
All steel-types are weak to electricity. All steel-types except those that are part ground-type.Assuming you mean magnet as in steel type Pokémon, they weak against fire, ground and fighting type attacks and Pokémon.
grass :)
Weakness as in types? Like psychic moves aren't effective on a certain type? Well, psychic has no effect on dark-types, not very effective on psychic-types (DUR), and not very effective on steel-types. Although, if you were wondering what psychic will LOSE against, (as in super effective types that damage psychics greatly), the the types would be dark-types, bug-types, and ghost-types. Hope I helped! :)
the strength is steel and the weakness is its weight
The biggest weakness for steel as a building material for ships would be rust from the water constantly touching the steel cold water temperatures can also make the steel brittle and weak so that is also counted as a major weakness as well.
Ice type Pokemon are weak against Fighting types, Steel types, Fire types and Rock types.
Grass type are weak against Ground Rock and water types. Grass type are Super Effective against Ice Bug Grass and Steel types.
Bastidon is both Rock and Steel type. Both Rock and Steel types are weak against Ground and Fighting. Either will have a x4 type advantage over Bastidon.
Water-type Pokemon are weak against Grass and Electric-types. Avoid using Water-type, Ice-type, Fire-type, and Steel-type moves, for it is their resistance.
Fire, fighting, rock and steel.